On 50meg maybe the wireless can't keep up when it's on 145, just a thought, 145 works for me but I am on 30meg.
Install InSSider so you can see what your local wireles situation is regarding channel use and them make your choice accordingly.
Yeah the wireless on the superhub is notoriously weak so maybe you will have to put up with it?
Gaming on wireless is not recommended even with the best kit.
Agreed about Be. I don't think I ever changed settings on the router as it just worked as it should, out of the box.