Campy 12s chain slip

[Fat Charlie]

This topic has been covered often, usually with similar solutions. I must be missing something... hoping someone can tell me what else to try.

Chain slip in smallest sprocket (11T) at power (>500w), obviously worse with small chain ring, but also happens in big chain ring. Brand new Campagnolo Record 12s chain, like new Super Record Cassette and Record RD on low millage Bora Ultra wheels and freehub. Nothing is worn out. Chain is the right length, not stretched (new) and the tension is good. I straightened the derailleur hanger, moved the limits and re-indexed (it is so perfectly sweet). Only started after I changed from SRAM 12s to new Campy 12s chain. [SRAM 12s chains run quieter over Campy teeth than Campy chains...] I did also re-grease the free-hub. Can a freehub slip and sound/feel like chain slip? Also set the B-screw tension to as close as possible (to engage more of the sprocket teeth). The cassette lock ring is at the required 40Nm and the freehub nut is clean and fits flush.

What else should I try?

Any input will be highly appreciated.

Charl

[NISI]

There could be a problem with the 11sprocket,did you try with a different cassette?

[Fat Charlie]

30 minutes ago, NISI said:

There could be a problem with the 11sprocket,did you try with a different cassette?

It looks perfect, without bends or kinks, but I will swop it out for a different one and try. [Fortunately my wife also rides 12s Campy.]

Thanks