Few years back, I took 3oz off my laver,,
The bat was huge and had a stupidly big bulge,,it was too heavy for me to play any shots with, so I sanded a mm at a time with an industrial disc sander at work, until the pick up felt a lot better
When I got it,,it weighed 2.12,, after the sanding(basically removing the bulge) it was 2.9
I scored 650 league runs that season and finished top 5 league averages
The bat lasted me a good four seasons use before a dodgy ball destroyed the middle
It's still in my top 3 bats I've owned
As for the weight removal,, I don't like concaving, so personally I would never remove weight that way
My bat ended up with a flat profile from the sanding
If the bats a really good performing bat, then it might be worth having some weight removed
If performance is not that good, then might be better moving it on?