practcie with a metronome for speed. increase the bpm's every minute or so until you can't keep up anymore. start at a comfortable speed (ie a speed where you can play the pattern 10 or more times without choking). do that honestly for a few weeks and you will hear massive improvment.

study the tab and music of the guys you want to play like (ie build your repetoire of music...along with your technique).
study the photos of them playing to see how they hold there hands and etc.

the thing with technique is that the scales or tricks you practice should transfer over to other scales and techniques...soif you really knuckle down on atechnique that uses alot of alternate picking and string changing and get it down pretty good and clean...the other stuff won;t be so hard (in theory that is).

just rememeber that if all you practice is diatonic modes and etc your playing will sound like that. so its important to practice playing music as well as playing techinque.