I agree, the left plug looks perfect. If I were jetting a carb sled, I would jet more like the right one, so there would be a bit of fudge factor when riding in colder weather. But for EFI, they should all be about like the one on the left.
The center one does look more oil-fouled than the right one. Not much you can do to change either the fuel or the oil. It's better to have a bit too much oil and fuel than not enough! As long as the sled isn't continually fouling plugs and runs fine, I wouldn't worry too much.
I would run a half can of SeaFoam with the next tank of gas, that may help clean out the fuel system a bit and give more precise metering. But I do a half can on the first tank on all my sleds, just because. I really should buy stock in SeaFoam and WD40