G'day

If you are burning lots of plugs, you probably have the engine tuned lean. Tune it for peak revs then back the needle out to drop the revs by about 300 revs and you should do better.

You also may be using too much nitro? 10% is more than enough, 15% is pretty usual but not really necessary but more will increase rust and decrease the life of the engine.

Mike in Oz