Have a look at Juggercube.
Please note, only phase 1 is 6 days, the intensity is lowish (max 85%) and the result was moving a 900lbs squat (raw w/wraps) to 937lbs.
There are probably some lessons in those notes.
Powerliftingtowin is also 6 days in the later stages but you only do the powerlifts 1 day per week. Again, probably something in that...