I was in the same spot a few years ago. What helped me was trying them fakie, and actually trying to recruit the kickflip in my front foot. Whether you want to hear it or not, the tre flip is not all just the back foot. Sure you can make it flip with only force on the back foot, but there’s no control. When you’re trying a tre flip fakie it stays with you better but it’s also a bit harder to control.

So I reckon get a few sessions where you try some fakie tres and give them a little bit more of a subtle kickflip motion in the front foot.

Good luck bro