Keep in mind that with today's fuels and additives, plug reading has become somewhat obsolete. The only real way to tell is with a dyno tune/sniffer.
And yep, you surely had a critter problem with that bike. Those little bastards can cause some damage in no time. They got under the hood of my old truck one time and chewed almost all the wiring down to the connectors, so you couldn't even tell what color the wires were anymore. Took my truck out of commission for about 3 months until an expert could re wire it.
Famous Last Words: "Watch Me!"
2015 Denim Black RG, FM ss ceramic coated 2-1-2 pipe, White Bros Original E Series Mufflers, FM ac, PV Tuner