A few points of advice:
- You really don't need to elbow strum the first note of the intro. Some people prefer it, but you have more than enough time to strum with your right hand, tap the first red and yellow notes with your left, and start tapping with your right on the first blue. Just keep practicing on Slow. You'll get it!
- If you're struggling to pass the solo, here's a star path that might help you. Ignite your star power right at the beginning of Herman's Solo, and it should end right before the next star phrase. This one and the next star phrase are pretty easy to nail (relative to the rest of the solo), so practice hitting those two sections. There's also a third SP phrase later on in the solo, if you can make it to that point. Then, wait till you're in the flashing red to use your SP, which will hopefully last you long enough to get to the GYO chord.
- After you pass the solo, you're not exactly home free; there's still the infamous "Red Snake" in So Far Away III. If you're in the red at this point, you might have trouble getting past it. But the best thing to do when you reach the Red Snake is just hold down the red fret and strum. You'll nail most of the red notes and should come out about even on the rock meter.
- If you can get past this point, you're probably okay to beat the song. Just watch out for the "You Rock" section right before the end. If you can nail the two SP phrases after the Red Snake, you might want to save it for this section.
In the end, it all comes down to practice, practice, practice. I spent many a frustrated hour failing at about 83%. Now, many months later, I can pass it pretty consistently. Just don't get too upset if you keep failing. Play onward! Your hard work will eventually pay off.