Sorry, but... with 99.9%, you managed yourself to grenade the engine (not one... two), if you readed this thread you may got some information on this thread, regarding the Ninja, Grinder (Uriah Murnan), I and others told and warned that combustion chamber should be raised a lot (in fact, I run at 25% and needed to put 0.6mm of shims, so going at 30% and depending you were, maybe more height should be needed).

Simply adding the shim that came with the engine, you fell short for about 0.3mm of combustion chamber height. The prove should be on the surface combustion chamber and all the piston (completely pitted and grenaded) and for sure you were blowing constantly plugs (or at least pushing severely the filament into the plug).