So it's the plugs fault you can't tune? It's a spark plug. It has design characteristics that are manufacturered into it. If you understand those, you can tune from the plug. Champion doesn't design a plug like Autolite, or NGK or anyone else. If you want a plug to go 50k look at the Autolite. The Champion plug is good for 5k on a piss poor weak suck ignition. 10k on the best ignition you can buy. On a stock engine. Add power and plug life goes down. There is a reason why it works that way.
Don't blame the plug. It's like a mechanic who blames his tools for crap work.
