Bulgarian Split squat leg tingling/ nerve pain?

Does anyone else experience a pain that feels like a pinched nerve with doing the Bulgarian spilt squat? I can only get about 5 reps in before my back leg starts to tingle and feel like it’s not not getting blood flow. I’ve tried every form adjustment and talking to the instructor about this after class to confirm my form is right (knee is staying over ankle, im leaning forward no back arching and not trying to support with the handle bars). I’m 5’2 with legs on the shorter side so my theory is the height of the reformer just isn’t conducive to me doing this exercise; I have no issues with this with any lunges or similar position when I’m up on the platform.