Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Eric, it sounds for me that you are over curing the transfer is dryer like you said. Also keep in mind that most transfer powders a made to put on wet ink. That is how I have done it for year with no problems.FYI I really like the white stuff.https://sourceone.nazdar.com/P/4575/White-Stuff-Heat-Transfer-Adhesive---FineThis low melt powder polyester resin adhesive is used on heat transfer applications. White Stuff is applied to wet plastisol inks prior to the final cure. White Stuff locks the ink onto the substrate with a permanent, durable, and flexible bond.
I like the one stroke powder more than any other I've test so far, but I am always testing new ones too