I've always used APC props on my YS's. Performance and low noise are excellent.
I used to run the APC 19 x 11 on my 170cdi with 30% nitro. I never had a non cdi version, but I think a slightly smaller prop may be better for that engine.
APC now have a range of carbon fibre props available, which are around 60 grams lighter and much more efficient than the glass props. With less flex, less throttle can be used and get better performance. It would be well worth checking if there is a size that would suit.
As mentioned above, using Cool Power I also just set and forget the needle.
I'm not sure if Rapicon fuel is available there, but i've been using it for about 3 1/2 years now. Like Cool Power, it's just set and forget also. I also think Rapicon looks after the engine better. I've noticed less wear in the bearings and ring.
Scott