Thanks man, reading such compliments from a great player like you means a lot to me.
Beckerish sweeps were something I figured out at a very young age by feel and I’ve never really practiced them, just started out missing half of the notes and then it cleaned up over time. I played a lot of stuff off Perpetual Burn and Speed Metal Symphony and it clicked. You just gain more control over time after doing them.
I think rest strokes aka planting are the key concept to this kind of sweep, I don’t just rotate to change pickslant, I pick the actual note with forearm rotation rather than wrist/elbow deviation (I think). Let’s examine that good ol’ A minor arpeggio:
e ---------------------12-17-12-------------------------------
b -----------------13--------------13--------------------------
g -------------14----------------------14----------------------
d ---------14------------------------------14------------------
a -12-15--------------------------------------15-12----------
If you start with DWPS setup you start your sweep playing A on the 12th fret and you rest the pick on the d string, it’s already waiting there to continue the sweep while you are hammering C on the a string. Then you just continue the sweep until the note on the 17th fret on the high e string. It’s the one that I play with forearm rotation to change slant and while I pull off from the 17th to 12th fret the pick already rests on the b string to continue the sweep. The important thing is that you are returning with upward pickslant so if want to loop the pattern, you have to play the first note of the next repetition with forearm rotation again to switch back to dwps, at least I do it. If you don’t do this you will have to hop. Maybe we should start a separate thread on it.
I don’t think you can get as much rhythmic precision with sweeping as you can get with alternate picking, even Gambale said that sweep is a technique to play fast.