Some nice hitting here, andre!
As for your most recent video:
Serve: Note how you're falling over to the left and almost getting out of the way of your toss. See how getting your weight more toward your target and your toss a bit more in front works for you.
Forehand: While you're bending your knees, you're not using the legs in the actual shot, which will give a safer margin for your relatively flat shots without loss of pace. That first mid-court ball you hit the tape on is a prime example.
I think your "bad day" could have been 90% mental; when I'm floating shots long, I find shrinking the court (i.e. imagining that the court is smaller and aiming for those imaginary boundaries) very useful.