in the EBI line-up
the GB2 is plenty strong and a great ball.
i have had this conversation with several current folks in the know
i am better off with medium equipment and drilling it a little stronger, then adjusting with surface changes form there.
the really strong pieces just dont seem to be strong in the right part of the lane, and if it does happen to work, it wont for long as they change the oil pattern rather quickly.
I have a longer pin and rolly layout on my GB2 and its plenty strong, im sure i could go much stronger if i wanted to.
you are better off keeping the ball straighter in the front part of the lane and looking for motion further down the lane if possible
what conditions are you finding where you need a stronger piece?