Managed to achieve a solid beginner standard for Uneven hangs (example). I definitely have a ways to go before progression standard is in sigh thougt; my left arm / hand definitely trails behind my dominant one (I suspected as much based on a year of bar hangs).
Having struggled to maintain a grip training habit for years; I'm excited to have bust through this plateau and finally move on to unilateral work. It's taken patience and discipline, adding only 2s to a single set per workout, but I'm pleased with where I've ended up. Hopefully this will help even out some problems in my shoulders and set up a strong basis for pull-ups.