Any question answered...

i noted in an interview with Mark Cavendish that he uses the aluminium ergonova pro bars as they are stiffer than the 2 carbon versions of the same bar and he felt the weight penalty was worth it.

Cav uses PRO bars, not 3T. He might've used 3T in the past.
He had his own, stiffer, version of the Pro Vibe bar made up.