Original Formula was a 2001 260SS 496 B3 drive. Replaced that with a '09 260 SS Volvo 8.1 duo-prop.
Same hull, both boats, but not sure if the newer 270 Formula has the same hull design. I almost immediately start trimming the drive up after taking off. I feel the vibration go away, most likely resulting in better mpg, and a slight increase in speed. Trim tabs to balance the boat only.
From what the OP described, I trim up a lot more than he does. It only porpoises if I bring it way up.
That said, for him it seems like it's the nature of the beast. If you trim it up 'til just before porpoising and you still feel vibration, maybe there's an issue. For me, trimming up removes the vibration but no porpoising.
Good luck finding your trimming comfort zone.
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