The 12x6 should work well with the SF another possibility with that airframe would be an 11x7 APC. It may be fun to experiment sometime.

I keep a well stocked "prop wall" just for that purpose and yes the are mostly APC. Another brand that I did like a lot was the Bolly from down under. They too performed very well in every application I ever used them. What was nice was the selection since they came in half inch pitch sizes, The down side of the Bolly was just they were just more difficult to find.

John