"My current '15 has the OEM GY G-114s and noticing some uneven tread wear--not from alignment."
Sounds like mine. Contact GY Customer Service. Ask to speak to the GY Rep in your area. Take it to a GY "OWNED" store!!! That is where I got chumped a bit by going to a independent GY store.
They pro rated 3 of my tires and the California Rep that I contacted after the dust had settled on the 3 tires had the 4th replaced for free on our return trip to SoCal.
This is what they look like prior to loosing the center tread and after. I had just checked the tires with a IR gun 15 minutes prior to seeing tread fly off.
If your tires are around this date code they are probably de laminating. Center tread comes off but outside does not. They don't blow unless you simply ignore them!