Hi!
No! we don't have any noise regulations over here in my club, nor are we limited to fly at certain hours. So noise isn't an issue here. I'm only recommending what gives best performance, from my own experience.
Remember that the OS .46LA engine are quiet powerful at low rpm, I would expect the rpm to be around 10000 -11000 with a 10x6 3-blade prop...it's no point propping it for max power (at 16000 rpm).
Of course 3-blade props are inferior two two blade ones, this is a knowledge accepted world wide.
Remember this concerns small model engine propellers like 6" up to 18-20"props.

Regards!
Jan K
Sweden