Agree with Buzz. On the gun bat that has a stain near the middle (towards the top end of the sweetspot and a bit to towards the outside edge), I can't feel but it really flies. Have hit a few edged sixes that have really surprised me.
Harder and stronger on that count for sure.
Doesn't explain why another one with the stain is nothing special. But then, there are so many variables that its not really an apples to apples comparison.