I sometimes run at WOT pretty much all the time, although every 30 seconds to a min I'll ease up on the thorttle, do a 180 in the dirt (which lasts a couple of seconds) and head back the other way at WOT... I mainly bash on a mixture of dirt, grass and loose gravel. There is the occasional stretch of bitumen (car park).

I'm running 16% and try to tune at least slightly rich, always making sure the temp stays within the recommended range (up to 135 C) and that there is always smoke coming from the exhaust.