It sounds like you may have air in your master cylinder. It may need re bench bleed. I personally never liked the 7/8 due to more pedal travel. I always thought a 15/16 would be perfect and I think they make it now. I ended up with a 1" on mine and preferred it over the 7/8. It was a higher firm pedal. It did take some leg.
Assuming your caliper pistons and master cylinder have been calculated correctly.
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Todd
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