Not sure what else to try, but I will recommend this for your next track day. Apply a good coat of wax before putting the tape on. At least to the area where you're putting the tape.
On second thought, you may want to try some
Goof-Off on it. I've had good luck with this stuff throughout different areas inside my house. It's supposed to be able to remove everything from chewing gum to tape adhesive residue. Try it on an inconspicuous area first to make sure it won't mess up your paint job.
Oh, one more thing. They also make a Citrus version that is supposed to be easier on paint, for whatever reason. Good luck!
Randy