best heat transfer mask?

hello,

I use masks a lot to put dark designs that have little pieces onto shirts. I use 3G Jet Opaque paper (open to try others) and have been using a mask that really doesn't pick up the design easily from the second layer of paper on the transfer paper.

Does anyone regularly use heat transfer masks? What do you like to use? Also what kind of paper do you use? I am looking for the best, cheapest kind.

I have found I like the hot peel best. Sometimes with the cold peel the design shifts when making and messes it up.

Any advice would be appreciated.

Thanks,
Mike