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This sounds like you might have a mix of PowerTorque cranks and UltraTorque BB cups. Earlier versions of Potenza cranks used a PowerTorque spindle, in which the right bearing was mounted on the crank, and the left bearing was mounted in BB cup. The latest Potenza cranks use an UltraTorque spindle, in which both bearings are mounted on the spindle. Does the Potenza crank have the full length spindle attached to the right crank (and a splined hole in the left crank)? If so, then it is the earlier PowerTorque version, and you'll need a different set of BB cups.
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