Absolutely. Thanks for looking at this for me, Cais. Appreciated.
Test page is here: https://dalesamms.com/test/?preview=true
NextGEN settings are still “override thumbnails” to 120×90 with crop thumbnail selected.
On the original live page I tried deselecting “override thumbnails” in Display Galleries tab in NextGEN and got a change in how portrait pics were displaying, which is better (https://dalesamms.com/gallery/stills/).
But still not the layout I’m trying to get it back to where everything displayed exactly the same size (https://dalesamms.com/gallery/headshots/).