lol - i like the fishtailing bit! it might be worth looking at different gear ratios to calm it down a bit and exploit the higher torque of the .18 - mind u thats gonna push ur top speed up too...

i found the power more easily controlled offroad than onroad, great for serious powerslides etc.

it may well be spluttering a little as its not quite fully run in yet, give it a few more tanks and maybe a little more leaning out and i feel u may well sort it.

have fun.