Better stopping power

[par69]

Hello everyone
My current brake set up on my 1967 chevy camaro. Front brakes consist of SSBC dual piston brake caliper with 11 inch rotors. Rear brakes consists of SSBC single piston brake calipers with 11 inch rotors (has built in emergency brake system also). The vacuum booster and master cylinder is from DSE. It also has an electric brake booster attached to this system. The brake lines at the calipers are the braided stainless steel type and the hard lines are stainless steel. The brake pads used in all the calipers are the EBC yellow stuff. It also has an adjustable SSBC proportion valve. I have 15 inch Centerline wheels all around (15x7 in the front and 15x 8 1/2in in the back).This brake works OK but I cant lock them up. I am afraid during a panic stop, the brakes wont stop the vehicle quick enough. My 1999 chevy blazer stops better than this system and it also has 11 inch rotors all the way around. I need suggestions to make my camaro stop better while keeping the same wheels. Would a 4 piston brake caliper with 11 inch rotor in the front stope better then my 2 piston brake caliper?