There is a gauge that I have that measures brake fluid pressure. I very rarely have used it.
At this point it would be worth considering getting one. If for some reason you are getting unequal fluid pressure that would be the cause.
I don't know if the original proportioning valve was removed from your car. I presume that it was.
I would look at your system for something that could cause uneven braking pressure including a small leak in the lines that you are not aware of.
Incidentally do you have one-man bleeder valves on the calipers? If you open them too much they will let air in. Air in the line would also create uneven brake pressure.
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