scx3 has the biggest sweetspot when broken in - it just takes forever to get there. The first 1,500 hits have to be pretty close to the center of the barrel, but after it loosens up, I agree with yank, it's pretty much the whole barrel
My scx3 and scn3 are in this stage^^^^ have to hit it in a smaller sweet spot but ever bp its getting bigger and bigger. Srv4 has a massive sweet spot too.
if you want a bat that has a giant sweetspot after a couple hundred swings the sb98's is huge. Every bat you listed will get a giant sweetspot, but all of them will take about 1000 swings or more to get opened up that much