Less defensive presence.............ya, I would think so.........
But how often do you ever play an under SEBBA????
The thing I like about OVERs (and kept that in mind when I devoloped my system) is that that there is a mathematical advantage to them. Obviously overtime is a huge advantage and every 8th game goes into overtime that I take action on. With that said, when I play UNDERs they hit 64% of the time. So while they're rare they're pretty economical.