I found that if I "pre-loosened" it, took a blade and carefully lifted up some corners, it would stick better to the transfer tape. But only the thicker, less transparent kind, which makes it difficult to accurately position. This makes me think it's something to do with how it's cut, as if the vinyl is being pressed into the backing somehow and needs to be loosened. But as I said, if I cut it any shallower I get incomplete cuts/edges.