concaving or no concaving
Simple question, where do u hit the ball most, and so where do u want to see the most wood.
Concaving effectively takes wood out of the hitting zone and redistributing to the edge. Giving a visually pleasing bat. If done correctly it can be a good way of bringing weight down, improving pick up without compromising on playability. The problem we face is, we all want massive bats at light weights, unfortunately willow doesn't always come like that.
Where it is done extreme and the incurve goes below the edge I reckon you're killing the bats rebound ability. Where there remains sufficient "depth or thickness" of wood still behind the ball you're not.