As far as your engine troubles I might be able to help you.If your buring up plugs then you might be to rich.What % of nitro are you using?I read an article the other day that said you only need a "cold plug" if your using a nitro content above 25% and you should use a hotter plug for nitro content below 25%.

A little off topic but my truck was running like crap because I was using 30% nitro instead of my usual 20% and the switch to a colder plug worked!So If your using 20% you should use a hot plug.