Hi Overlap,
Great! I’m glad you’re enjoying the videos!
This is quite a common error I’ve seen many times working with players. You’re right you want to keep the angle consistent during the stroke. What I would suggest is to really slow your stroke down and feel the ball as you make contact. If you watch from 1.23 you will see what I mean: https://tabletennisdailyacademy.com/videos/feeling-and-control/ When you slow down you will begin to naturally find the right angle and you will be able to maintain consistency with your stroke production.
Is there any chance you can send a video in to us so we can do a analysis?
Another tip that will help is to focus on your timing, perhaps you are striking the ball at different timing points which is altering your strike action. Try to maintain the same timing point (ideally at the top of the bounce) so you can develop the efficiency and consistency.
I can also recall a time when I was coaching a player who did this exact same thing you mentioned, his wrist was breaking and going to much forward when he striked the ball which caused him to hit the ball pretty thick. I used an analogy with him which worked a treat which was to imagine your bat is going up the side of a mountain slope, it really helped him keep his bat angle going in one line.
Hope one of these tips will find the solution! 🙂
Dan