So the drive ratio on my bravo 3 is on a sticker- and it is bleeding away at that. it makes me wonder if yours might be a 1:2.0 labelled as a 1:1.65?
BTW, I have a 1:2.20 on a 350 MAG MPI bravo 3 at 22" pitch both props on the counter rotating pair. It would seem that 26" pitch is ambitious for your setup.
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