Topspin technique

Hi coaches, I’d like to ask for some advice. I’m struggling with my topspin technique, mainly my backhand topspin—especially against backspin—where I can’t seem to be consistent. I play at a lower level where players are used to playing backspin to backspin, but I’d like to play more offensively and win points on my own rather than waiting for my opponent to make a mistake. However, I’m not able to stay consistent, and I’m not sure exactly what I’m doing wrong in my technique. To start with, I’m trying to build as much consistency as possible. I know it’s easier against a robot, but until I can hit 10 out of 10 balls consistently on the robot, I don’t think I’ll be able to transfer it into matches yet. Next time, I’ll try to record some competitive or training matches as well. Thank you in advance for any advice.Topspin to topspin https://youtu.be/EunjAT9O-HsTopspin to backspin https://youtu.be/ghJMQ23m9oo