A simple way to improve your position is to add some ankle range of motion.
Try this simple ankle mobilisation and see if you can feel a difference. Test retest with some squats.
Get in position and mobilise for 2 mins per side.
NB: Make sure you reproduce the hip and knee alignment you want in the squat. I.e. Don’t shift your hip outside your knee or let your knee collapse in. You don’t want it to happen when your lifting so don’t do it while you’re mobilising.