I am running this exact wheel/tire set-up and really love it. I did purchased/mounted tires at costco and I've had them re-balance a third time already. First time I was feeling steering wheel vibrations around 50-60 then again at 70 MPH. Second time that changed and I was feeling it at 70+ getting worst at 80+. Third time "may" have been a charm. Haven't been able to fully test this yet.
Initially I thought I would need an alignment to fix this, but the alignment guy told me to take it back and have them speed-balance each corner. Unfortunately the costco supervisor didn't know what speed-balancing was, so I just left it at what speed the issue is coming up. The outcome is that costco says the balance is correct and that what I am missing is hub rings, which I understand are not needed for the Pro Race in the 63.4 hub bore. I'll have more to report once I test further.
I am also considering that springs may be the phase 1 suspension approach for me, but wondering what rubbing risks I may run into due to the wider wheel/tire stance. My only complaint of the stock set-up is the bounce it goes into on the freeway. As for tracking, with the new wheel set-up my next track day may prove me wrong, but no complaints from my previous track day on stock wheels. I don't mind the larger wheel gap, but the freeway bounce I could do without and springs seems like a more cost-effective solution for that. NOT comparing springs to coils here.