I've had a bit of an issue with the rear wheel on my Mango Point AR frameset that I built up over winter.
Previously, I had some basic cup and cone wheels in, since replaced with Cosine 23mm disc wheels. Both wheelsets have suffered slipping when I'm hammering it uphill, so much so that the wheels pulled out a twice (most recently knocking my wheel out of true!).
I've bought a new QR skewer, an Ultegra internal cam type, and I've roughed up the surface of the rear hanger to try and make it more grippy. I've also bought some Ritchey Liquid Torque.
Hopefully I'll be getting the wheel back this weekend and I'm going to try it with all the above items and a lot more clamping force.
Don't suppose anyone has any miracle solutions to a very frustrating problem? I love the bike otherwise, really great frameset for commuting/winter riding!