I've got a Brison 3.2 and I'm using Bambula props. With the 20 X 10 prop, I get around 7100 rpm. I wanted to try a lower pitch so it would be more stable in hover. I tried a 22 X 8 and I'm getting only 6600 rpm. I haven't had more than two flights with it yet, but it seems to be fine. Should I run this prop on this engine? Is 6600 within the range this engine runs well?

I realize that because of the way Bambula props are designed, they usually get less rpms than other props of same size. Here's the quote from their site:
*Do not expect these props to be "RPM Kings". Bambula Power props do what props are supposed to: MOVE AIR! (or through it; depends on your point of view) because of this your engine will experience a heavier load and will not turn as many RPMs as it did with other props. Bambula Power Props provide maximum PULL POWER.