I assume you still ride your P3C. The warning below is posted on the Zipp website. I don't know if by P3 they refer to the old P3 or if it is the current P3. Anyway, I am quite sure someone that knows will chime in...
Warning:
Variation in individual chain stay specifications on these bike models may cause interference issues with the 1080. This is more of an issue for heavier and stronger riders (>170 lbs), but Zipp strongly recommends you test the compatibility under riding loads and conditions before making a purchase.

• Cervelo P3, P4
• Ridley Dean and Noah
• Scott Plasma
• Giant Trinity Alliance
• Argon 18 E-114

-JM

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"Know how to get into the pain hole......you can go faster then you think." - 596

im 150lbs