Guys, I think there is some misinterpretation of BigD’s comments (D - please let me know if I’m wrong here). He is not saying you need to reach further back, instead he is saying you need to reach back sooner. Also, more emphasis is required on shoving knees out to the side.
Try doing this with an air squat
Stand tall then turn your pelvis over (point your butt out back like Donald Duck)
Shove your knees out to the side
Sit down as far as you can keeping your feet absolutely flat on the floor
After a few goes try and make the first two cues happen simultaneously
Once that is feeling Ok try and make it one super slow (15 second descent) but fluid movement
Check that your feet are staying flat and most importantly that there is no knee movement independent of the hip.
Let me know how you get on