Well, practice is paying off. Also, The Norseman's idea about playing Bass on Hard to get used to the speed has helped a lot. A lot of emailed suggestions, which I appreciate.
I'm now in the high 80% range on the 0 and 1 star difficulty Guitar tunes, which is a big improvement. I've even completed a few Diff lvl 3 songs. I got a 93% on PDA. Woo.
I had a hell of a time last night with Feel the Pain, but managed to finally get through it. So, it's coming along. After a couple of hours on Hard I went back to Medium and it's like the game is in slow motion. Amazing the difference in speed.
My fingers are numb this morning.
I may need to take a break...