rounded chines combined with the slight v bottom will make it bob about more than a square chined flat bottom boat of equivalent length - it has to as water can slip past easier so reducing stability slightly, although some of this can be offset with heavy ballasting on a short boat or loading if full length (and full length are completely stable anyway).
i am new to all this and i am learning from @DShK who is the restoration man, @agg221 who claims to be an engineer as well as a restoration man and all the other good people here