I would definitely pop your transmission sprocket cover and clean all of accumulated crap out of there as well. If you're getting build-up on your peg, chances are the sprocket is spinning in a ton of grit/grease.
It sounds like extra lube is being flung off. That is why I lube my chain after I ride, when the chain is warm. It helps it 'cling' more to the chain and not fling off.
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