Greetings from Argentina!
I discovered Troy´s content a while ago and realised that I been using elbow DSX as my primary motion since I started playing (around six years ago). Since I became aware of this, I´ve been adapting USX phrases and solos from various players (specially Yngwie), getting faster and cleaner than ever. Now, theres some types of licks (economy picking licks, sweeps and some scale runs) that are really hard to adapt into DSX phrases that are “confortable to play”.
Should I approach this licks with DSX until I find a “resource”, for example a “helper” motion, that allows me to do USX? Or should start working on a USX secondary motion for this kind of licks?
P.D: I don´t know if its helps, but apart from elbow, I can do a pretty fast tremolo with forearm motion (that as far as I know it is associated with USX).