Rainer, you looked like you were very high percentage landing those BH opening topspins. You appeared to be anticipating the serve receive to go there, and often it did. You seem to make good spin on the BH loop, good. Often, your BH loop is very predictable, usually right at the player and these two opponents can block and move you around. When you varied your placement and made them both move, you won nearly every point. You made some nice transitions from BH to FH, but seemed to be lacking power on your Fh topspins, almost none of the many FH topspins you hit towards your opponent's position seemed to trouble them much, until you made them move. Making an opening BH topspin doesn't usually win the point,but it can give you a nice ball to continue the attack and build pressure or finish the point. You will develop this more and more as you continue to be aware of what you must do further to make more trouble for your opponents.
You stayed near the table, no more than 1/2 meter back, which is a good position to make opening Bh topspins. 1 full meter back or more will make you go on the run to hit those BH topspins and doing that greatly reduces your landing percentages. You often reach too far forward and hit the ball too far in front of your strike zone and that leads to to mistake after mistake. You avoided that from the two clips I saw.
Now that you have the basics of anticipation and actually landing the loop with OK spin very consistant, there are several things you need to improve upon those topspins to trouble these opponents enough to win the majority of points.
Placement Depth: A close to the table blocker loves a slow to medium speed loop near him where all he has to do is lean forward, place the bat into position,and block - too easy and it is very high percentage to do it 6-10 times in a row. it is hard for you to make 10 topspins in a row every rally. That is the first reason why these opponents could outlast you in match play. Your loops were not landing very deep, mostly in the middle depth or 10 - 40 cm in front of the endline. That is the worst depth to place a slow or medium loop. You give too many options to your opponent to take pace or spin off the ball, and to either put the brakes on the ball or add speed to it, plus,they get better angles and you have less time to cope with the return. You need to either land the ball extreme shallow, like just past the net, or very deep within a few cm of the endline Not landing the topspin there, if it was a slow or medium speed topspin, is going to result in giving your opponet too much to work with.
Spin variation Nothing frustrates a close to teh table passive blocker more than changes in spin he cannot perceive. You have to be able to hit the topspin with much less reduced spin with the same body and arm motion. A close to the tabel passive blocker cannot tell the change of spin and will pay the price for it when you do a "Change-Up" loop. Once he tries to adjsut to that, you make HEAVY spin and he blocks it out or very high.
Speed You need to be able to make a powerloop much more often. You are getting the high percentage chances for it if you look for them. I am not saying your first topspin should be a powerloop, no. I am saying that when you get an easy ball, you should be able to do a powerloop to a good location and it will be a direct point winner. There is nothing like a nice BH loop to give you one of these balls. You already have a good pivot when you anticipate the ball coming to your BH or crossover, so why not use that to win more points? You were in hte game stepping around and making another topspin similar to the BH topspin, so why not make more power when hte chance is there? you have to place it well, so sometimes, one more loop to move the blocker will do. A slow to medium FH hookshot to a right ahnded opponent's wide FH is a really nice setup shot. When you did that in the match, you moved opponent (soemtimes won the point on that shot!) and gave yourself a chance to blast by him on an open table with many options on the angle. Of course judgement will come into play here, buit the more you strat thinking about this and trying it out, the better you will get at finishing points.
Placement (side to side) of loop. You made too many topsins with poor depth RIGHT at the spot your opponent is standing! You did not move opponent around much and let him move you! It is harder to make a BH topspin land down the opponent's FH line, but once you can do that at will, look out! A down the line BH topspin can either win the point outright, or give you a nice ball to finish, if you are looking to finish the next ball. An opening BH topspin crosscourt to opponent's playing elbow is usually blocked back to your BH, so why not make the next BH loop down the line to move the blocker to get a block to your FH, then be ready to pivot and do a FH power loop either right back at him ( n easier and safer shot that can still win the point, or down the BH line for a winner? Once you try out these combinations, you will be much more effective. You have already the shots to execute this.
One way to get more power on your BH topsin is to get down some more and get yur right shoulder rotated in front of you some more. Remember that you must have your nice position like you did your first BH topspins, only a little from table, crouched and ready to move. You explode up and forward, using more forward swing than you slow opening loop. You adjust the blade angle to be more open and explode/wrist snap through the ball at impact. Once you get this shot down, your opponent will have cutting hte ball to your BH, he knows there is a price to pay. The same concept applies to FH concerning the forward movement and balde angle and follwothrough more up for a ball that carries more underspin. With the FH, you get teh leg behind you some more, rotate a little more, stay loose and accellerate better. it takes some time, but it will come together.
You already do a great job connecting shots in a rally, but they are nor constructed in a way that troubles your opponets in these two clips. You already have the ability to make most of the shots needed to achieve this, you just have to think about it, envision it some more, and start doing some combination practice to get there. if you cannot train, then you will have to risk losing some more matches to get this down, but you will be a far stronger player later.