Drain plugs and spin on filters...probably the two most needlessly over tightened fittings on any car, truck, boat and virtually every other engine. Once the plug is snug, just a bit more is all it takes. Same goes for filters...once the gasket touches the surface, 1/4 turn more is all it needs. If you can't remove either easily by hand...you've screwed up.
Let the threads and gaskets do their job. No need to hammer either on...