I think it looks killer with the stance and full wheelwells , if you think it will definitely rub then I would say move the rear in a smidge. That would seem easy to do at any point if using spacers as you described.
I don't have facts or experience regarding the four link but it would sure seem that you could adjust the rear end back on the side needed...but if all links are equal lengths why are they producing such a different position?
Initially I thought of a geometry math problem when you posed the question. I would be tempted to draw out representative scenarios or make a popsicle or similar stick model... maybe on an inch to mm scale? Or just to play with if it is easier to adjust than the 4 link which would seem to be a given. Is each link adjustable in length? If so you should be able to move the wheel in any direction, how much before binding something is the question.