i tried a wrapsol, the problem with them was horrible product (bad QA) and it was too thin so it still exposed enough of the antenna to let deathgrip settle in. Gelaskins looks like it might work but it also looks like it might expose too much of the sides so if your palm touched the side part (very small area) it could make you loose the connection.
BSE: have your tried holding the phone in your left hand? not just the finger?
Side-note: im seriously considering nail polish.