Sorry for the delay. It would hang at different points just after any zip install process began, but usually not long into it. The spinner bar would freeze and that would be that. When I switched recoveries, the flash was so fast I think it got past whatever block was there with larger files. The phone is now functioning like a champ. Also, since this incident, I have worked successfully with the latest TWRP. I think it was the Gummy Nightly to be honest, or some interaction between that file and TWRP. It appears to be resolved.