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I assume that you're using only a single master cylinder setup?
If so, you may be right about having a too-small master cylinder. (I'm just comparing your setup with the ERA, which has a dual-master setup, factoring in using equivalent piston area.)
Our total master cylinder piston area is about 15% greater than yours.
Your caliper piston area is at least 50% larger than ours.
Therefore, your mechanical advantage (and thus the required pedal travel) is 75%+ more than ours. That's a lot.
I would also check that the front and rear calipers are square to the rotors.
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