Kirk Hammett uses a lot of wah-pedals when he's soloin. He gets a get of a grillin about it, but I don't mind it to be honest. Also you might wanna add a lil more distorton to get more sound out of two hand tappin. Boost the mids as well if there's an equalizer settin on your fx thing. Makes those high notes a bit crisper as apposed to sounding muddy.