Haven't been getting them in directly after rehearsing...
Most have been a few minutes here and there while dish washing or driving. But here's what I've done and found:
Close Every Door
Focused on brightening the sound until it is uncomfortably so. Then contrasted it with over-modifying every vowel.
Focused on breath and using it up on every musical phrase.
I've found that the brighter and more air I use, I can hear and feel more vibrato in my voice.
Problems with the descending eighth notes at the bottom of 54 and top of 55. Need to work on supporting and keeping it legato.
Otherwise, I've had to keep my rehearsals short. My throat has been sore either because of drainage or I'm using my voice incorrectly. I think it's the former.