I asked a similar question beginning of last year:
QA1 UCA and 17x8 wheels?
My OEM wheels have a touch more BS that you are thinking about, but in my case it just looked too close and no one posted the same combo so I decided to just stick with the stock UCA's instead.
If you do end up running the QA1 UCA and some 17x8 wheels with 5+ inches of BS, please post some pictures at full droop and and both full left and right lock.