Sounds like your technique may be coming into question. Or maybe try a sports bra.
as an aside the longest possible hand jamb reach is with one hand thumb out at the waist with the opposite hip towards the rock and the other hand thumb in arm stretched out straight up above.
Another big question about crack climbing is whether to use tape or try to develop calluses. The only other choice is spider mits. A major factor in crack climbing is avoiding the pain. If it's painful to grip the crack you won't be able to hold on near as hard or as long.
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