hey nik i'll give you a tip bro (not saying that you are) dont tune your engine at all until it is up to operating temp !!!! as far as plugs go , ihave three favorites in standard plugs ; mccoy mc8 , odonnell 77 and nova 6 . turbo plugs either a novarossi 6t or an odonnell 77t , dont use os , pico or any other brand of plug in nova engines !! different taper in plug seat !! mugens might work but never tried them yet , plus they are high $$$$$$
later , monty
if all else fails , maybe jimmy can help ya , i think he knows a few things about racing !!
oh and by the way that was a great clutch setup for me when i tried the losi buggy for a few gallons , try a robinson clutch bell , smooths the engagement and lasts a lil longer and always use a 14t bell unless it is a really short track then try a 13t bell .