Darock,
I have two of these engines and I felt the same way when I read the instructions. I've run almost all of the props on the list including the 14-7 three blade.

For me, I felt the 14-6 was the best prop.
15-8 was OK for scale flight.
16- 6 flew suprisingly well but spool up was really slow.
The 14-7 had really slow spool up also.
I have not tried anything smaller than the 14-6 since I was so happy with the performance on my Kyosho CAP 232 60 size.
Tower/Bax et al suggest getting the engine to reach 11K+ and the 13-8 prop. I was getting 11,500 on PowerMaster 10-22 and the 14-6.
I know you are not too far from me so send me a PM if you want to barrow some props.