Hey Matt (raving-monkey)
I don't think many people in the UK still use receiver packs. With the advent of 3300's and now 19t spec racing, if you have ok gear (unlike me!) you won't dump. Even with a 12t mod you should be ok as long as you don't wedge the throttle stick up when you're racing.
Keep it smooth and make sure you don't have duff cells (like me!) and you'll do 8 minutes fine!
Liam