You need to stick with an XT specific piston whichever size you get. The wrist pins are not always in the center of the piston, many are offset some to prevent tipping and knocking at TDC. The XT600 is centered but I don't think the Grizzly's are.
You said you haven't taken the motor apart, how do you know the cam is good? If it was starved of oil, even for a short period, the cam and its corresponding rocker get wiped out and make a bad knocking/clanking. The other is timing chain slap. Doesn't mean the bore is bad or needs to be redone. Though if it is dug into very far it is nice to just make things new and tight again.
If you wanted to you can just get a new sleeve and drop it in your cylinder, have it bored to stock size and re-use your piston with new rings, it comes out just a little cheaper that way but it is stock compression though. There are way to up it but it involves more machining.
If your looking for a power boost, the hi-comp isn't going to get as much as you'd think with the stock carbs. You'll gain way more usable power with a stock topend but better carb(s) than an improved topend and stock carbs.
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