Ben,

About your comment that, "...but it sinks into the gaps that it's covering, which sort of defeats the purpose." Why do you feel that the tape sinking into the gap between the wing root and the fuselage is something to be avoided?

To me the main purpose of wing tape is to seal the gap against air intrusion, not necessarily to continue the wing's airfoil without deformation. It seems that all wing tape "sinks" to one extent or another.

My $0.02.