I remember when I switched to my current Inzer Lever belt it was tough to accomodate to. The lever kicks ass, so much easier than the prongs. What was different and tough to get used to was the belt overlaps inside. I tried but the belt on so that the “middle” was on the side just so the overlap would not be on my sides.
The 13mm power lifting belts are meant to not be bendy. 8-10 workouts in you will have either adapted to it or it won’t happen ever
THe thing I’ve found with the leaver is your need to be VERY accurate with sizing or you end up with alot of over lap. Almost like have a phone jammed down between your belt and abs.
If you do have a lot of overlap you could try sawing it off?
I had/have so much trouble with my lever belt (getting the right size/fit), I just bought a traditional belt from EFS