My 1.25 took long time to break in. I had a gallon through it before it really came to life. Mine also does not like the APC 16x6. It pulls it down and it never seams to get into it's power band. Many guys are using the 16x6 from APC with great results. I am just not one of them. I even tried 30% nitro with out much improvment. Then I tried a Mater Airscrew Scimitar series 16x6. This is a wooded prop. Now the spool up is instant and I gained 1,000 rpm. This was about a year ago. I have not tried the APC prop again. It could be the 1.25 will have a better time with it now. I just don't see the point. The MA seems perfect for it.

BTW I am at 2,100' ASL and running 15% power Master and a OS "F" plug.

David