It is "hard to hit 100% the right notes in a crazy run", but you can eventually do it.

Once again, it depends whether your problem is figuring out what the notes should be, or playing them once you know what they are.

I think there may be not a lot more to add than already suggested. Take the run to pieces, note by note. Also, studying scales can help, because knowing the key the piece is in and the scales the guitarist tends to use can also help suggest the notes.

If you know what the notes are, then two things are good

1) Playing the phrase at the speed you can, and working up
2) Playing a tiny piece of the phrase very fast, and stitching these together.

GaJ