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Doing the math on your weights, including the 5 batteries you have indicated, and putting the engines in at 650 each, oil and Rev-4 props, it appears the bare boat is about 900# over the Boston Whaler factory spec of 5850#. I am not surprised at all when seeing the huge size of these FC's.

No one whould ever believe outboard engine weights on the higher HP models either. It has been shown that all manufacturers lowball these, some more than others. I have also thought that Boston Whaler has done the same on boat weights for years. The Outrage 18 comes to mind as one of them, and I think my Outrage 25 is heavier than specified also.

There is a 10% B.I.A.approved leeway on horsepower, either up or down. I can think of several Yamaha outboards where the HP is oversold. The original 225 V-6 4-stroke is one that comes to mind, at more like 210 HP
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It's pretty scary to think your 300's (or any brand 300's) could legally be sold as anywhere from 270 to 330 HP, without being considered misrepresented. That is huge range considering what they cost.

I have heard that the Mercury 300 Verados and Optimax will outperform the V-8 Yamaha 350's. Don't know if that is true or not, but it should NOT be true, that's for sure. But the V8's are carrying around an extra 200# of weight over the Verado, and 350# more than the Optimax.