OK, I just was wondering if a switch to a 58 cc Magnum head was an option. That'll get you it right around 11 with, KB or JE hypers and .035 gasket. But I guess you'd have to sell the Indy-x heads and you wouldn't have forged pistons.
Those Ross pistons look great but I suspect your gonna need a bit of machining on the lower edge of the dome with those heads' chamber shape. Still a good buy. With no spark slot, it looks they are set up to be machined a bit anyway.