I just wrote some cool 4 finger taps, previously I was only able to tap out one part of eruption, like 10-5-8, 10-5-8 9-4-7, 9-4-7 etc something like that anyway, I found if you use your wrist to silence the lower strings it makes the tapping sound a lot clearer and less muddled expecially on the high e string
And just this morning I can suddenly sweep! Not bad considering I just started trying it a couple weeks ago. Its not so hard once you get down the motion and the way you let the pick "sweep" across the strings.
I also switcheed my regular picking technique instead of free floating I anchor my pinky to the fretboard kind of like how marty friedman does it. Its a lot faster and more accurate except when you switch strings, but couple more weeks practice and it should all be peachy, wierd when I first started playing I anchored my pinky too but then I read that its a bad technique so switched to free floater