what Bore master cylinder

Increasing the bore size will increase the pedal effort,and the required movement of the brake pedal to do the same "braking" will decrease.
Bigger bore = harder pedal,less movement required.

You go to larger mc bore sizes to compensate for increased volume required with bigger caliper pistons,wheel cylinders,ie bigger brakes like you have. Those bigger calipers have
more clamping capability, but also take more fluid volume to operate.

So yes,in your case a bigger bore is not only better,but necessary.
I would talk to Baer or Wilwood, and see what they recommend for their brakes.
I would think a 15/16" to 1" bore would do the trick.
JD