Out of interest what year are you bindings?
I thought all snowboard boots needed to be heated? My girlfriends Vans were done in the shop, my 32 I did by wearing them, took about a day before I could feel them get more comfortable?
My formulas are 2012's. I actually took the F20's back and tried Burtons before I settled on 32's.
As for thermal forming boots, the owner of my local says it's good if you have a specific fit problem. Otherwise it just breaks down your boots sooner.