I had a set of 790's that also fouled the fairing badly on full lock, it's a shame, because they were perfect for me on my Tiger 1050.
Here's a pic of my old red Fazer with ultra lows fitted.

I rolled them quite far back to make them cosy, and filed off most of the switchgear lugs so they still gripped the bars. I think mine 'just' touched on left lock, but then, my fairing wasn't exactly straight!