First, start out by picking on one string without fretting anything for a long time (3 minutes). Make sure to use the smallest strokes possible without muting the string with the pick. Play slowly at first. Do this 3 times (3minutes picking, 1 minute resting X 3). Speed the metronome up 5 beats per minute. Repeat the whole thing for an hour.
Then after that start practicing a personal favorite scale (I love melodic minor, diminshed or augmented myself) with this technique just like you did it before for another hour.
I guarantee this will help you acheive better picking ability. I have a lot more on this, too. If this doesn't work e-mail me and I will give you something else to do.