Rear Wheel Cylinder Bores - disc swap

I run a dual M/C with a 15/16 bore, and the fancy teflon-lined front hoses. And as mentioned, the factory KHers, with 10x2.5s out back. Also a booster from a mid-70s Dart.
Awesome brakes! Stops like crazy with the big tires. Great modulation. Initially, I had a bigger bore in the M/C and it was harder to modulate on the edge. Yeah it had a harder pedal, and it took a bit more leg power. But braking on the edge of lock-up was trickier. And I was just 47 at the time so don't think that I was; old, weak, or ready to be put out to pasture,lol .
When I say brakes like crazy, I mean it's like throwing out a giant anchor; Hang on Lucy!
'Course I have a10.9Scr, Manual-tranny-equipped, fire-breathing,6 liter engine; with the idle speed set up so low that when I take my foot off the gas, that too tends to want to slam your nose into the dash-pad; so much so that the car is real easy on front brake pads.Compression braking is not to be taken lightly!,lol