Making pull-offs resonate

Hey, im a self tought guitarist. So i have some technique problems. But i am in no way a begginer. Im trying to play some iron maiden licks, and i cant get my pull-offs to resonate on the upper fret register. :mad: . Is it because my bolt on neck of the fender strat. or my finger technique. Im thinking my pull off technique so if anyone can give me pointers i would be happy to hear them -

klninjaboy

The notes don't sustain as well in the higher register.... you'll need to pull down like CW14 says....

also ive found that using the meat of your finger closer to the knuckle rather than jus the tip helps along with pulling of