15/16" MC with 2.75" calipers any problems with stopping ?

Fyi the area of the 4 pistons in 1 KH caliper is 8.4 but you can only use the area of 2 pistons due to their opposing nature* So the resulting area is about 4.2 sq in and your single 2.75 caliper is about 5.9 sq in.

15/16 piston area is about 3
1 inch piston is about 3.14
1 1/32 inch piston Is about 3.25

Simple math can get you the respective ratios for the combonations.

Then measure your brake pedal and get its ratio

A little more math and you can get final ratio.

* Thanks goldduster318 for noticing my error. The mythbusters proved it with a head on collision between two cars and one car and a block wall. Same amount of damage.