Sounds about right. It's not the worst, but under warm conditions, and depending on gas quality, you'll get some timing pulled and run hotter. From what I've data logged, the engine always protected itself by pulling timing. I was able to find some software to piggyback onto Revo and add the necessary fuel to keep up with boost and timing. It's a bit of a pain, you'd need full VAG-COM setup, but it works well.
Just a note, I heard a while back that if you use the SPS tool to reduce boost, as in going back to stock, you can't bring boost back up. This may be true, and I've been lazy in data logging to confirm, but I reduced boost, and when I added it back it sure didn't feel as if it was there at the previous level. I'm using the custom SPS tool settings, 3 for boost, 5 for timing.
Eurocharged in the states, Viper in Europe, good reviews by every user on here. APR for $2k seems a bit steep, sure it's nice. MTM might be available.