Hi folks...Adam from Praxis here.
This thread came up on my radar and I wanted to reach out.
We have a huge amount of customers with this exact setup and loving it, so I'm interested in what the possible issue is also.
Our rings on a Quarq (new and old Quarq)
with Campy 11 has actually become a very common setup we've been helping people with.
One simple first fast step would be to please check the mounting. Believe it our not, we actually find that many have actually mounted our inner rings in the wrong timing position and also many times flipped the wrong way. Both of these will completely mess up the shifting.
This is one of our #1 calls/emails and is quickly fixed.
We're soon adding/updating the ring markings to make it less likely that someone accidentally mount them wrong.
Here is our mounting guide to follow - http://www.praxiscycles.com/wp-content/ ... unting.jpg
Other than checking that, like you guys mentioned in this thread...I'm very curious about the chain, the FD setup and the FD mount/braze on as we come across flexy mounts with frequency also.
Anyway...we're shifting geeks and just want to help out. So by all means email or call us and we'll for sure try and help shake down the potential issue.