I finally have a video where I don't feel like I look hilarious doing FH strokes vs underspin. It's not perfect but it's serviceable and doesn't cause stress on my body at all so I'll need to gain some confidence in it and use it when I play. I think if anything I can still work on a more forward swing and feeling the ball more. I showed 2 sets here because I watched the video of the first and made corrections for the 2nd, which gave better results. I'll still have the same problem as Boogar, where my match play is much worse than my practices. Not sure how to dissipate stress in match situations but will take any advice anyone has to help.
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Doing a stroke vs a robot is different from doing jt in multi ball which is very different from doing a stroke in practice drills which is again different from doing it in practice matches which is again different from doing it in real matches. Each scenario adds something important that is a piece on the puzzle in developing true confidence and competence in your abilities.
The robot delivers a mostly fixed ball which doesn't place any pressure on you to read the spin or location or depth or even the racket of the feeder.
With multi ball you get the racket of the feeder and a more human element but still artificial.
With drills, if they are similar to the matches, you get a relaxed opportunity to hone a skill but the training partner will likely not have the degree of variation you have in a match and you don't have as many demands on you to adjust to the opponent.
Practice matches are where the fun begins as you have to use what you have learned combined with a lot of other skills if your opponent doesn't know what you have worked on. Then you have to read the play and adapt your skills to it usually without the pressure of serious consequences with a loss. This is the beginning of developing the skill to true usage. The usual problem is not reading and adapting to the play, usually the spin or the location/placement. You have to look at what happened to the ball when you miss, investigate the causes, and then adapt your stroke and ball read. This should be a feature of all your practices and drills but unfortunately, most people are only forced to start this in practice matches when they should adapt their training to support this before this level with subtle variations to make their brain adapt faster.
Then you have tournament matches. If you can use and adapt the skill here, then you have broken through.
Dubina and some people add in a Match point level, or a match point down level, which is whether you would use the skill match point down when you need the point. In these situations, there is an extra pressure that affects your confidence in the skills if they are not fully formed.
The point of all this is to say there is nothing special or magical about looking good in practice and looking worse in matches. In fact, LGL says that there is no proper /teztbook technique on display in matches or points where you are pushed to your competitive maximum. He was in part joking but anyone who plays at a semi serious level or better understands what he means.
So take your stroke through the steps above and then you will start looking as good in matches as you do in practice. But until then, do not describe the disparity as anything special. It is when you get stuck at doing the skill in practice matches and cannot do it in pressure matches that you need to visit what the drivers of this may be and how to fix.