Getting stuck on details of the Yngwie system is something I regret to admit I am actually pretty good at, so I think I can feel @Interestedoz’s pain here from bitter personal experience.
If you are running four note chunks and you have straight up-and-down alternate picking with a USX mechanic it can become deeply engrained into your experience that each chunk starts with a down stroke and this can become an intrinsic part of the feeling of locking into the chunks.
But when you pick DUDD for a chunk ending with a swept note, the following chunk UDUP (P for pulloff, here, although we’re derailed in this analysis long before that) has to start with an upstroke and this is really really disconcerting at first even if there is nothing otherwise wrong with your USX motion as such and even once you’re timing the sweep sweetly. It feels like the post-sweep chunk is upside down and horribly broken, unless and until you get used to it (which it happily turns out is mostly a question of getting used to it).
I have no particular advice to add to Troy’s except that it is (of course) possible to include upstroke-initial chunks and it is (of course) essential to do so for the Yngwie methodology, and it is a simple matter of reprogramming your concept of chunkhood and its picking correlates, and if you use CtC best practice – look for a speed too fast to be brain-driven but not too fast to be brain-corrected and just try and adjust to this strange new chunking world – you will surely succeed in reprogramming yourself.
(And the same goes for working in the pulloffs when you get that far, although I am still working on that myself – my own personal pain-point is the Black Star lick, where successive chunks of three start on the pull off, but it is slowly becoming less disconcerting)
