I have started to analyze Yngwies solo sections more in detail, and this is what i find him doing alot. Legato phrase 2,4,2,1,2,1 and the other fingers version 3,4,3,1,3,1 using the index middle and ring. This is so he can gain back picking strength for more bursting ascended economy down up down down up down or down up pull off during descending inside his little mixed minor box shape. So really if you arent going to flamenco, even they use a descended form of picado economy, you should be figuring out directional economy picking. utilizing plucks or down up pull off during descending cross string madness, or up down up up down up if its a pure 3 note per string scale descended run. Otherwise pure alternate picking is left for the single string line stuff, or also for outside picking 2 string tetrachord pattern style runs ala paul gilbert exercise.
And really it’s what your genetics can do the fastest so I would look at it from all angles. If you aren’t playing it fast enough try something different.
Because believe it or not I can play this basic descended harmonic minor with this wierd picking pattern the fastest even though it has an inside stroke. I believe I can do it because it is so close to the low end strings that my wrist has this tendency to tilt the other way cause of the prior descended economy I have going that is slightly tilting my wrist into an upward pick slant, plus it is one inside stroke so it doesn’t tire me out.