"He who marches out of step hears another drum." ~ Ken Kesey
110's ? did you mix your inks well enough before the run, what was the ambient temp? rainy day?dude that BLOWS.....I'd puke.
yes, you can discharge an 80/20. test first.
There is no doubt the red ink gassed and pigmented the white, most definitely during the oven time. As to why who knows exactly but i suspect heat a lot of it. Or if this was not visible till it was washed then you could possibly have a curing issue, over cured that is.
When you say 360, you mean with a temp gun?You sure they weren't redyes? If those hoodies were red, and they redyed them black, you could still have migration issues, and 20% polyester is enough to screw them up.I used to do retail, we had stuff that sat on the shelf for almost a month before migration was visible. You never know with that crap.
Pretty sure Andy nailed it with the crocking suggestion. Reds are known to do this, especiallyhigh pigment reds, then add in the fact that you P/F/P over an already P/F/P underbase, and you'vegot a lot of ink/pigment sitting there. Washing machine will surely pick that up and deposit it on that nearby bright white.