Agree on the back squats. Everybody ius diffrent as far as ratios. I back squat 565 and I front squat 455. If you want to use a clean grip then use the Gillingham straps or in the same style that Facz mentioned. It allows you the benefits of the clean grip that Josh mentioned without having to worry about your fingers slipping.
Heres a 445 with the Gillingham straps. They are a great piece of gear.