Well you look like you know all the basic techniques but your muscles are way way too tense to execute them.
This leads to forehand shots being weak, slow, and often times not even spinny. The kind of spin where your whole body goes into it and it's still weak, slow and not spinny. It also makes you miss the ball entirely.
For example:
5:12, 7:08, 9:16... Well actually all of the forehand shots. Body too tense.
Also it leads to dropping serve receives into the net because you're stiff-bodied moving INTO the ball, which is the only thing you can do when your muscles are tensed really, where instead you should be putting your spin on the ball. Moving into the ball stiffly only magnifies the spin on the serve and makes it more dangerous to you, so even a slightly underspin serve will drop straight into the net.
It is also why your chops tend towards high and long and miss the table (though I suppose the MX-P might also play a part here). Stiff movement with muscle so not absorbing the energy of the ball and not spinning it.
I suggest you try to loosen up so your body is loose except for at the moment you touch the ball. But that'll happen anyway naturally so never mind that, just try to be loose always.
You play better with your backhand because you don't try to put muscle into it and so everything is more relaxed and spinny, so that's an example there.
That's the most basic problem and I think working on that will improve your game all over.