RE: DZ160 and 4-blade prop
You are hearing this second hand, but I was told the 15.5X11 four blade has better vertical, but misses the pull right after the snaps at the bottom of the loops in Masters, for example. Anyhow, ask around, sounds like there are some new prop sizes out there both 4 and 3 blades that are working well.
I'm using Magnum YS DZ blend fuel.
Don