Why speculate on such? Why not just prop them correctly? As to whether running at 40% load instead of 30% is bad, I don't know, but I feel like running them inefficiently could be bad, forcing them to work harder for less. You're doing that throughout the power curve, not just at WOT. WOT is just where it's easily measured, but at all speeds it's overpropped. I just don't see why though it's a discussion when one has identified a boat is overpropped. Seems simple. Just correct it.