Can't remember if I've tried that or not. I'll give it a shot next workout as I'm really not wanting to abandon doing this program low bar.
I use a thumbless grip currently, with the bar resting closer to my fingertips with wrists pinned back. Normally this keeps the elbow issues away, but also normally I'm only doing low bar once a week with other variations in the other slots. With this volume and frequency it's apparently too much.
Wrist wraps help if you’re not currently using them for squats give them a try.