Looks to me like it's coming from the slave. I cleaned up everything around it and had a friend push the pedal in for me. When the pedal was down completely and the slave fully extended, the rear part of the seal (next to the transmission) would start to seep fluid. He did this a few times and it looks like it keeps coming from the same place. The bleeder is fully sealed and the line is tight, both are dry with no signs of leakage.
I'm going to order an OEM Nissan slave this time and hopefully that fixes the problem. The one on the truck before this replacement appears to be the original that came with the truck and gave me no issues until last Friday. The replacement lasted 4 days before it started leaking.