As far as i know there are no bows in the stock shapes. Dont know about custom made.
My observation of bats initial performance is that Scats do perform from the beginning and start to get better. the same with TK bats. Lavers are different they are pressed in a different way, they arent all that responsive to start with, but improve with use. According to James his bats will overtake most others in time, due to the different pressing technique. But nothing wrong with scats pressing.
Tom (Ayrtek) . . .has yours improved with use.?? if so by how much.