Here's my $.02 worth. I bought my TCS with boosters removed and no changes to the MC. My first drive was scary as hell, I thought I had no brakes! I had all sorts of plans to re-sleeve the MC to a smaller bore, or swap a different MC, but after driving the car for a few months, I got used to stabbing the pedal with authority and the brake upgrade gradually slipped down the priority list.
Another approach you may want to consider if simply drilling a new hole for the brake clevis 3/8 inch closer to the fulcrum. I can't find my original notes, but I think that works out to something like a 35% force increase. You would also want to raise the pedal assembly by 3/8 inch also to keep the line-of-action in line with the MC centerline to prevent off-center forces from scoring the MC wall, but that is an easy do also.
Tom