ive been fiddling around with 2 bats (count em!) this weekend
both 2lb 10 oz in weight
one is a bowed grade 1 uk made(salix)
one is a straight blade grade 2 flat faced bat (GM)
the bowed bat picks up much much better than the flat bladed bat, so much so you would think there were 3-4 oz's in weight difference
I put this down to 3 things myself
1. the grade 1 is a better quality willow
2. the grade 1 has a mid middle, the grade 2 has a mid to low sweet spot.
3. the grade 1 has a slightly thicker handle on it and has 2 grips fitted-the grade 2 thinner handle and one grip.
and lastly......I think the bow help pick up a little bit as well-how much...I don't know.
not scientific at all-just my opinion