Thanks RapidRobert! Your sugestions might be the way to go.
Let's say I put on 11,75" discs and run an adjustable proportioning valve. Would the 2,75" piston caliper do any difference?

Also, the car now has 11" rotors and the pads seem to be in the proper position along the disc. What confuses me is that when measured end-to-center bolt hole the adapters measure 3-3/8" wich (from what I have read) tells they are 11,75" rotors. Any input on this? Just to know if I need different adapters to run the 11,75" rotors.