Flare is, well, flare. What you're seeing here is probably "ghosting" or a lack of contrast, although I'm not familiar with the performance of the 35/f1.8 in such conditions. Certainly if this had been my 35-70/f2.8 AFD, it would be ghosting.
Flare looks quite different. This is flare:
Re: polarizers. Kind of a problem. Tamron has some of their hoods built with a handy slot in the side of the hood, but some folks have complained that this makes the hood too flimsy. I don't use a CP that often, and when I do I just take off the hood, set the CP and then replace the hood. But then again I probably am shooting on a tripod where that isn't as big a deal.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!