Although you COULD sit back more and hold the bar lower, I don't feel they are required. Fazc has preached quite a bit about squatting more knees forward, instead of butt back. Personally, I sit back more and start my decent by sticking my butt back, but both are valid methods.
I do think it's important for people to try different holds. I started high, then came down, then pushed it to see how low I could go, then moved back up to a place in between over a number of years. After all this experimenting I feel like I have a good hold that works very well for me.
Current PRs at 242, raw w/ wraps- 525, 355, 605, 1485
Roboro tui, perimo vester adversarius
(Build yourself, destroy your enemy)