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Installed a water meth kit and threw in a new set of plugs to get some extra insight as to what’s going on in the CC.
First question, the timing mark on the strap. Is it where the color change is from the tip to the first line or the line closer to the base? See pic
second, heat in the cylinder. Is it measured from looking at the dark area and how far it moves down the side of the plug?
Removed the intercooler and running 50/50 water meth.
E85 primary fuel
turbo @ 32lbs soon to turn it up to 40
32lbs
its a polaris XPT.
1000cc
precision turbo.
Current record holder in the 300ft sand drags. This page and yellow bullet are the few sites I know people know their stuff. If I posted this in the SxS forums I would never get a response.
I agree on the timing mark. Wouldn’t go any farther though (that’s just me). Heat should be into the second thread. E85 can be hard to see at the base of the porcelain. I’d go hotter plug and pull some timing back out to start. Get the heat onto at least the first thread, if not the second and then put your timing back in it. Again, all just my opinion.
Whats your cylinder head temp look like? At the RPM's you get on a ATV motor your going to have slightly more aggressive combustion and the ramp of the piston coming up starts the heat in the chamber before it fires, Also are you testing your E85? I'd expect that motor to behave a lot like a Midget engine(For other tuning comparisons..) , Have you considered E100? No substitute for pure Alcohol.(And its hard for someone in the supply chain to mess you up..) Post up a vid of that beastie!
Heat looks good. General - You want the coldest plug that doesn't foul. Timing looks good, at the mid point of bend of strap.
How much timing will you pull at 40psi before you sneak back up? Are you using mph to monitor gains?
Why remove IC? Not working? Water/meth great to reduce CC temp but not much for air temp. Every 50F drop in IAT increases air density 10% (add supporting fuel = more hp) and helps drop CC temp.
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Spark plug reading gurus 
Post up a vid of that beastie! 