Sorry for the delay on this! Had a difficult start of the week!
Not exactly Troy but I am part of the team. You can think of me as a cheaper version of Troy
So, my more detailed thoughts on your examples are the following: I am not convinced that you achieved a clear USX motion in any of the examples, not even the last one that you say feels better (by the way, if it feels better and allows you to play enough of the stuff you want to play, that’s great and you can of course use it!).
I have the impression that your more strongly memorized DSX picking path tends to creep in every now and then. So there are 2 ideas to address / work on:
1 - Exploit fully the power of your well-established DSX motion. So you’ll want licks that exclusively change strings after a downstroke. A super-classic example is this (shown as a boring chromatic exercise, but can be applied to any 3nps fingering you know):
-------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------
-------------------------------etc.-----------------------------------------------------
-------------------5-6-7-5-6-7-----------------------------------------------------------------
-------5-6-7-5-6-7------------------------------------------------------------------------------
-5-6-7----------------------------------------------------------------------------------------
D U D U D U D U etc...
Then you could go into pentatonics and find patterns that satisfy the requirement while still starting on a down, e.g.:
-------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------
------------------------5-7-etc.-----------------------------------------------------------------
------------5-7-----5-7-----------------------------------------------------------------------
--------5-7-----5-7----------------------------------------------------------------------------
-8-5-8----------------------------------------------------------------------------------------
2 - In parallel you could keep experimenting to find a USX motion to play other types of phrases (e.g. gipsy jazz, YJM vocabulary and so on). To do so, you are probably better off if you try a completely different setup (arm position, pick grip, etc.) compared to what you are using now. This is to minimize the risk of interference from the DSX movements that you know so well. Our most typical suggestion for this is to try the Steve Morse / Albert Lee 3-finger grip.