Simple fix Jimmy, just get an editor like Adobe Audition, tune your guitar half step down, then tune the Dokken songs up or down to taste using their pitch adjustment. I do this all the time with cover tunes, for clients and for times when I just want a different flavor. Adobe has one of the best engines for handling this algorithm with the least amount of artifacts.
The artifact you guys are hearing with this pitch thing (though I'm not so sure what Pilson said about the piano is correct and I'll tell you why) is tape. Artists adjusted tape speed for various reasons. Some singers found they couldn't hit the notes in 440, so they dropped the tape pitch/speed a little to hit the notes.
Other times, a song done in a higher key just sounded better/meaner a little lower. Unchained, for example....theoretically, is in C# if you listen to it. But we all know Ed tuned 1/2 step down and played it in D. This is tape speed adjustment. My belief is, it's the same with the Dokken stuff. Sometimes Don didn't have such a good day and may have fallen short on some notes. They would sometimes drop the pitch, sing the parts, and then pitch the tape machine back up. If it didn't show forth any artifacts vocally, they left it. If it did, they tuned it back down as the instruments didn't suffer as much from the artifacts as the voice would.
Speaking of pitch, and I know this is an old thread....but here are the pitch block settings that work for me. Everything else in this thread as far as set up has been shared and what I do as well. What I didn't see, was the screen I'm sharing here. Anything under 5.00 in tracking picks up weird artifacts to me. The default 6.17 is great too, but I seem to notice a little latency as opposed to 5.00. Could be in my head though. But if you've not tried this setting, go for it and make sure the pitch block is first in your chain, fixed harm, one voice only set to -1, 100% mix, no delay, no detune, no feedback and then try this screen. It's the best I've been able to get. The only thing I'm not happy with, is what it does to my clean sound. Sort of watery, but definitely acceptable if you HAVE to use the pitch block in this manner.