Greetings,
There are a lot of routes you can take to eliminate your problem.
You can look for LOW ADHESION or LOW TACK on the description of the
tape.
Since it is just the backer, I don't know why you have to use any tape at all.
Normally, I would think you just trace the shape of the project onto the backer and
cut the backer out.
Finally, if you really have to use the tape on the backer, you can either use
mineral spirits to release the glue so it removes easier or you can heat the tape
up either with a heat gun or blow drier and I have even heard of members putting it
in a microwave for a short time. That will make the tape come up much easier.
Good luck with your project and God Bless! Spirithorse