It might be the way you read and hit notes. In GH3 you pretty much need to hit everything early, whereas post GH:Metallica this is frowned upon greatly.
Try adjusting hyperspeed and changing characters. I generally play with Casey Lynch or Judy Nails, they seem to have the best fretboards for me.
Also, don't strum hammerons. GH3 does not like this.
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47|
64|
30|
69|
41|
86|
49|
47|
85|
47|
88
Full Series:
653/
660
[00:23:13] <gerg> !8 MAH DICK IS SOOOOO BIG
[00:23:13] <ChanServ> gerg: Not on your life.