Power lifters are the very last people you should ask for tips on form. They sacrifice form for their lifts. Just watch them bench, enough said.
To find your squat depth, you can try the hockey stick on the back. Make sure it contacts your upper back and sacrum. As soon as you feel your sacrum slide on the stick, you're getting the "hip wink", which is flexion down low at L5 S1. There are a few other tests but they're hard to describe.
Many people squat through the hip wink. Go for it. But theres much more loading on your discs with flexion, especially the most vulnerable lower lumbar. You hurt that disc and good luck going back into that hip wink.
Watch olympic lifters. They can all full squat with no hip wink. The ones who can't don't make it far. Only the odd genetic freak.
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ech·o cham·ber
/ˈekō ˌCHāmbər/
noun
An environment in which a person encounters only beliefs or opinions that coincide with their own, so that their existing views are reinforced and alternative ideas are not considered.
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