Hey Chris,
How thick are the fingers on your calipers? I measured mine and they are right at 0.700" on the nose from the outside of the finger to the back of the pad. That is at the "thick" area. You saying the little finger right there on say the middle one is what is flexing?
Also, the backs of these calipers are nicely done. Twin piston with some fairly decent cooling fins cast into them. Those cooling fins will make a great perch for a manifold for brake cooling.
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