well it seems to "hit" harder at 5100 rpm but when switching that high theres diffinitly a dip around 4500 or so so i think i'm gonna keep it at 4600..
i just checked it again since you said that. it's right now. b4 it was like 10-12 idk... now i'm paranoid. i went for a drive and the stumple at 4500 or so went away.