There was a full body-full boring template in Beyond where you did actually do all 3 each workout if I remember right, but it was not really advised.
If you want full body work there has been a lot of success reported with:
-Full body template, (3 days, Original 5/3/1 book or Beyond book)
-1000% awesome (3 days, New 5/3/1 Forever book)
-Krypteia sort of seems like full body with the assistance work, (4 days 2 cycles, then shifts to 3 days)
If your body can take the full body stuff it's great, but for some people not really giving certain parts a breather can really catch up with their joints.
Having a 315 bench/squat is kind of funny, (jealous of the bench for sure!) I would think if you gave any of the above a shot your squat would shoot up.