The hoodies may bleed into the white transfer. Its called die migration. You would need special inks for polyesters to avoid this. IDK which inks though but I can tell you transfers do usually have die migrations with the poly blends.

 

Rutland SF2 LB white, or any good quality Low Bleed ink will be ok for this blend. But when in doubt you can use 100 poly, but you will get a heavier hand.

 

Did the job with the inks that I mentioned...... came out great!!!!

 

I would have said that the inks you had would be fine. We P-F-P white on any blend, even when using a Poly ink. I have never used a black ink made for polyester because I never felt that there was a bleed or dye migration issue with black ink. If you are doing a lot with this type fabric, I would use a regular, quality black plastisol. It is probably less expensive, reduces your ink inventory, and saves money.