I haven’t really found a downside with my flex tune. It’s great to jump back and forth.
I had a local reputable tuner do mine. Not sure where NOVA is but you might find someone near you?
The car is beastly on e85. Have fun!
I’m running the 19’s with similar backspacing. I have to assume that your set up will fit fine.
edit: if I would just read further down….
my wheels are both wider and with a slight bit less offset and they fit fine. I think you’ll likely be fine.
I had taller front tires originally and it did well enough…
when it came time to replace the fronts, I went with a more appropriately sized tire and the car feels much better and more balanced