How's the fitment on a 2015 with the steeda progressive lowering springs? Any rubbing to be concerned about? Also, do the OEM lug nuts fit these wheels, or would I have to get a new set? Might pull the trigger on these depending on what this new price point will be.
My pony emblem and GT are holding strong after about 2.5 years. The edges of the 5.0 started to show about a year ago. I pressure wash my car with an electric pressure washer, so it might be weaker than yours, but you should be good. I can't remember how many coats I put on the emblems.
But I'm using the stock TB with stock tune, so I don't think your problem is tune related.
I'll have to play around with my car for a few days to see if I can recreate the surging. If I recall correctly, the last time it happened to me was when I was accelerating somewhat slowly in 1st. But...