Right, I know this maybe preaching to the converted amongst most people on here, but I've a couple of observations for you all on knocking your bat in properly.
I've been using a few of the old, used, ebay bats that I have in the nets, alongside a couple of other things that I've picked up. The older bats mostly have tremendous middles and go a lot better than I would have expected. They also have been used for a while and therefore are well knocked in. Three of them go like rockets! I've also used a couple of bats that are not fully knocked in alongside my match bats from last year and these.
There is a noticeable difference. It does beg the question as to how many people on the forum really, honestly, hand on heart, knock their bats in properly? Are many people using bats that need some work and therefore the willow is not responding as it could?