I've been subbing for 3yrs and if you haven't tried this again since you made the video, I think replacing the teflon with parchment paper. I never use teflon for subbing because it blocks the heat, parchment paper protects the sub paper from burning while allowing the heat to get through. If you've found a way to sub with a iron since you uploaded the video I'd love to know! I need to sub something small that I can't put in my heat press or oven and my choices are to either try with a iron or buy the cricut mini heat press. Thanks so much for the video! Happy subbing!