[spdbrake]

You can go to a 7/8" slave and the pedal will be easier. But the throw may not be enough to disengage the clutch.
Random made up numbers here: All things being equal you are at a 1:1 ratio. 3/4 master and 3/4 slave. So say your current master moves 50cc in 1.0" of travel in the piston, then your slave will take in 50cc and also move 1.0" of travel.
Switching to the 7/8" slave it will move approx .75" if 50cc is supplied.
If disengagement is an issue in this configuration, you can still disconnect your master pressure hose. Adjust the clevis rod on the master so it shanks out internally at approx the same time the pedal arm touches the carpet. This is to ensure you are getting benefit of the full capabilities of the 3/4" master. You may also end up with a tall clutch pedal. (does not sit even with the brake pedal)