I have always been use to 2.6/2.7 bats. But this year I got a 2.10 - SG player's edition. It felt heavy in my hands and after a hour of net practice, my arms were dead. Then I added a second grip (2.12 with extra grip, toe guard, oiling & sheet) hoping to improve the pickup which it did but I had the same issue after another net practice. Shot timing was good but 30mins later I was too tired so timing went out pretty soon after. The edges and toe give a lot of vibration which probably contributes to the fatigue.
Then I got a Spartan MC edition Small Mens weighing in at 2.7. Felt a little bottom heavy but still lighter than the SG. Ping wasn't as good but my arms weren't tired after a 1hr net session. I still wasn't completely happy. High vibration and shocks can be felt in the handle.
Then came the Laver & Wood. Weighing in at 2.12, C-10 handle, extra grip, oiling, toe guard and sheet. I took it to net practice yesterday. Almost 2 hours and no fatigue in the arms (I batted the whole 2 hrs). Now, maybe it was the previous SG bat which gave my arms the workout to play with heavier bats? So, I went back to the SG but the pickup/feel difference just felt wrong. To the point where I am thinking of selling the SG. Absolutely zero vibration, even from the toe and edges from the Laver.
The point being, two bats weighing in almost the same but with different pickup/feel and handle (Bottom Oval on the Laver) I think make a huge difference. The other interesting thing I noticed was the swing. With the SG, I feel as though I need to put an effort to swing the bat whereas on the Laver, its very effortless. I just have to time the shots and that's all. This contributes to saving energy too. The Spartan feels light on the swing too, even lighter than the Laver but the lack of ping and high vibration on it makes it more suitable for indoor.
YMMV. In my opinion is that we should worry less about the dead weight, instead get a bat that feels right and that's well made along with a good handle. Along with the pickup, how it also feels on the swing is something I would look for.