Make sure that you aren't using a low profile cap on a trucker's platen, that was a problem I was having at first.I have a terrible time trying to heat press caps. I either wrinkle the transfer or put a crease in it. Can anyone give me some good advice on the correct way to do caps?
I use a wash cloth (referred to me by someone here) to fill that gap.
They do sell smaller (or larger) platens at places where they sell presses, you'd have to check your brand to see, and maybe ask around here if you aren't sure.