I had problems because it was overtuned, but it always ran like a bat out of hell, just pulled timing, causing little bumps, certainly when hot out. The issues cj is having are much more severe than anything I ever had, just saying. All I had to do was reduce the tune, find that sweet spot with boost and timing (thanks to your help Quattro), and add that bit of fuel with some free software. Granted a bit of extra work, but I really enjoy knowing all the details.
Revo will add WAY to much boost if you let it, but still find it odd you've got issues on the lowest setting. Again, maybe a bad flash as others have mentioned. I've heard they did an update years ago, try and check your version. They were always good support, and I got my tune already on the car. Sounds like some air or fueling issue, backfire is just crazy too have!
Ross-Tech cable is a must for many other reasons, best $250 spent on the car....because most everything else costs more than $250
Edit; There are two users fighting with Eurocharge issues right now, most likely overboost also...things will happen with tuning, certainly at home...