I've noticed this also. The swivels that worked fine on my M1S90 don't work so well on my SBEII because of the shape of the fore end cap. I've tried several types of swivels but haven't found any that don't rub on the end cap. It's annoying but I've learned to live with it.
If you happen to find swivels that solve this issue, please let us know.
I also preferred the feel of the SBE II when I handled both models in the store. I also like the fact that the SBE is a proven design whereas the Vinci is relatively new.
A Burris rep posts regularly over at the oldgobbler.com forums and is very good about answering questions. They have a section for sights and optics and I'm sure if you posted the question there it would be answered promptly.