Actually @Jyak I think that last pic is a 145…because those fancy deck bags are only available for the 145 (I don’t think they work on a 175)…
Could be. I wondered about that because i really haven’t paid close attention to the models. I searched 175 and that was the clearest shot. The deck height on the 175 is about 3/4 inches lower, but the additional 3 feet in length gives greater buoyancy. He know I don’t were a spray skirt so the idea of holding an edge with 1 1/2 inches of freeboard doesn’t register. One reason I was able to use the 125 Tsunsmi is the excess freeboard. The only time I’d have problem in the 125 is with large waves from the side. Then I would roll with the waves, which is why I bought bigger boat, after learned about calculating safe load. Live and learn.
All I know is that I find it damn near impossible to get the cockpit rim of the 175 anywhere close to the water! LOL I think I’d have to stand on one side of the cockpit rim to make that happen. 
And I weigh 210lbs!
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Exactly.
While the question of scaling is certainly interesting, the model name is purely marketing.
That’s my impression. I believe about the only thing that will flip the Tsunami is a breaking wave that curls.
The exercise I did with different sized Tsunami (120 SP, 140, 175 and the 145, surprised me. Have you logged any trips and compared the avg speed between the 165 and 175 Tsunamis. By paddling the same course 20 times each season for the past four seasons, I’ve been able to predict my avg speed within the first 1/4 mile, base on the conditions. That allows me to moderate my speed for the first 15 to 20 minutes then jump to the predicted avg and try to stay .2 mph of that average. I only exceed the average speed if gaining an assist from conditions and focus on increasing speed when below average. If I push .5 mph over the average, the speed drops below avg for at least the same period. However, if I push .2 mph over the target average speed, i can sustain it longer and return to the average speed level as I recover by opening my grip (possible with a longer shaft) and doing cleansing breaths.
Do you use any App with a speed graph to monitor your speed spikes and drops?