Pad choice goes a long way to improving the stock set up.
FYI some data I have saved.
Caliper piston areas
Austin Princess
Pistons 38 mm x 4 = 3.142 x 19 x 19 x 4 = 4537 sq mm.
Rover V8 caliper
large piston 57 mm = 2,552 sq mm
small piston 40 mm = 1,256 sq mm x 2 = 2,513 sq mm
Total piston area = 5,065 sq mm
Rover pad = 4056 sq mm
Fosseway caliper for Rover
Pistons 41 mm x 4 = 5281 sq mm
Fosseway pad = 89 x 51 mm = 4,539 sq mm
Note single pot slider calipers are calculated as 2-pot, so the Escort RS Turbo Series 2 with 60 mm pistons has a total piston area 3.142x30x30x2= 5655 sq mm.