I'm monitoring a 6 mile link while on an RB435 w/ an R52Hn and see the CCQ jump sporadically to 106% , 102% . How can the CCQ be more than 100%?

It means that RB it's a (( foreseer))... knows what will send before it willl send.
CCQ max is 100%

using nstreme protocol sometimes you could get ccq values over 100%. You don't need to worry about that ..

Then I believe the code writers have a bit of work to do.

Dual chain?

If the radio dropped to a single chain speed while physically connected in dual chain mode then you'd have redundancy, thus 101%.

This doesn't happen on any A/B/G hardware and I haven't seen it on any single chain 802.11n hardware yet.

Does this qualify?