A 30 inch board will work, but trying to get it to break the surface adhesion enough to get it to turn will be the tough part. In the very late 60's early 70. Overlin had a series called the "Water Brothers", the wide spot was ahead of center and they has a fairly full tail with not a lot of "v" or rocker. In an attempt to turn, it would roll up on a rail, but not follow through into the turn. You could tell that the tail was being sucked back down onto the water, where it then wanted to stay.