Like others have said, 75-78 starts chime walking and can be a little scary. I have a 28 with twins and it's a real handful in the 80's. Haven't touched 90 yet, will give it a shot next week when we are at Lake Lanier. I think the 26-28zx's just like riding sub 80.

The running surfaces are very similar. The 26 is 26.5 and the 28 is 28. The handling will be better on the 28 because of it being twins and a little more weight in the back. Careful with the 26 I had mine hook a few times on me.

When I bought my 26zx a few years ago it had a M1 pro charger set up and ran right at 80 and pretty steady at that speed. But to get there the you had to drive through the chine walk at about 75, this seems to be the norm with this hull. Back to stock now it runs 71 to 73 and it's very happy with those speeds no ill handling. Plus my wife doesn't scream as much when it would chine walk.

Lol they get over it!