crazy banana

I am glad that I don't have to deal with temperatures that low anymore, but have you looked into the Agribon frost cloth? It may not protect your plants all the way down to 10 F, but it comes in different thicknesses. There is also something called "De Witt frost blanket" which is supposed to protect plants even better than the thickest Agribon available.
I would also recommend not only to focus on wrapping the plant but also to harden it off as good as possible. Stop fertilizing at least 6-8 weeks before growing season ends and maybe feed an extra dose of potassium for stronger cell walls of your plants.