looking at your picture of the high comp piston -
I would like to suggest that while you are at this point (waiting on the head) before installing the pistons you might want to break the sharp edges of the domes and valve cut outs, this will help prevent hot spots later on.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter