It is very stable, actually I was quite shocked how stable, especially seeing how he's basically running the stock steering. He added a sidewinder steering for safety, but that is basically a shock adsorber. There is no chine walking even at 80.
The boat is a '98 Fastech bottom. I believe the hydromotive prop helps as it provides stern lift and thus keeps the boat running quite level at high speed. As a matter of fact he outruns faster boats in the rough because the boat runs level while others are flying out of the water.
We tried a 30 merc labbed Bravo1 which ran the same speed as the 28 Hydro, and while the boat got on plane better it also ran with more bow lift and would launch on bigger waves where as the Hydro kept the boat more level.
One other note, we tried a right hand 32 Bravo and the prop would just cavitate with any power put to it. Do these boats have to run left hand props? I figured the prop blades were providing too much stern lift thus the cavitation.
The only thing I don't like about the Fastech bottom is the tracking. The boat can be blown off course by the wind even at cruising speed, but its stable at high speed.

In addition to my above comments, I also believe that the 1.65 drive and the 32" prop. had something to do with the handling. If I could have run a 1.50 drive and a 28" or 30" prop. I think it may have calmed the boat down a bit, I also never played with the X dimension on it, so I have no idea what it was or what it would have been like had I dropped it or raised it via spacers. I hope you have good luck with the set up, I did like the boat and it had amazing mid-range punch, it just needed more time then I was willing to give it to be set up better. On to the next boat...

That's what we found as well, we couldn't get a prop to work right with the 1.65 drive. Swapping to a 1.5 thus running a smaller prop solved the problem.

Troutly, I think the tracking issue is a direct cause of the ventilation of the hull. I guess its showing there is air being introduced along the bottom which is why it has a slippery driving effect. I guess its a trade-off for the high-speed stability. Pad bottom boats, such as a Velocity track as if on rails, but will chine walk at high speed.