[cdavisdb]

IMHO, CG, both vertical and horizontal, is pretty important in these boats. Bigfluke noted that the CG (I assume with the orginal twins) was farther aft than usual. He got his best performance moving the CG forward and adding weight. My boat is lighter than original by about 500 lbs due to going to a single I/0 and not tail heavy at all. Changing power plants moves the CG forward, but mine still likes more weight forward, especially when running light. When coming home from a long trip, light on fuel, water, ice and groceries moves the CG aft, one big guy moving from the engine box to the steering area makes a big difference in pitching and seems to increase speed.

Vertical CG greatly affects rolling. My experience with deep Vs is that those with very low CGs are reasonably docile lying in the trough. High CG deep Vs can roll your guts out. The seafari 25 is not as bad as some, formula 23 for example, worse than others. I've been very careful not to add weight up high. Also, when light, my boat easily rolls the outboard hull panel out of the water at the stern, accentuating the roll. That is not as bad with more weight in the boat. I'm planning to do some stuff with bigger trim tabs to try and damp down the roll.

I'm thinking along the same lines as ScottM.

A bit rambling, hope this helps.