Hey Rich!
Glad to hear of a Picco! I have some .40's and .60's..but never have seen a 45 DF.
I think your engine will run those props if you get your pipe set right, but I think (opinion) that you need to drop about 1" diameter to run on a fan engine. I don't think a fan engine will turn either of those props in the RPM range the engine was designed for. My guess for RPM is 17/18K?? I would try to prop for 20K static with at least 8" of pitch...Just my opinion, my engine is an OS...and I like Piccos!
The plane sounds great!
I run 6 OZ of fuel..4OZ tank with 2OZ header tank. Runs sweet all run long.