Rich, which 4 blade prop/pitch are you running to get 68-69? Also, where is your JP set – Flush, Up, etc.
I am running a 25p Bravo 1FS (65.0 mph at 5800 RPMs – JP is ½” up from level). With my B&B 23p Fury3 I have run 67mph at 5770 – this is with the JP flush. I am going to run the 23p Fury3 tomorrow with the JP up ½” after reading these posts. Will post my updates tomorrow.