Another spiral user here. The FD New Spiral 2/0 is my blade of choice. However, if I'm cutting something that doesn't have much in the way of "breath holding" areas, I'll use a reverse tooth blade. Definitely need to stack cut with the spirals!
Hey Woodartist, The objective is for support - not so much multiple copies. I used cut one at a time, but have found stack cutting (expecially delicate pieces) to be benificial. Give it a try and you will see the difference.