I have recently purchased and drilled a couple of older LM/Legends Gems. I have an original Big Bang on the way and I am looking for drilling opinions. I am a medium speed tweener PAP R 4 1/2 up 1 1/2 decent amount of tilt. I have 2 Yeah Baby's , one is label leverage and the other is 50x4x40. I also have a NS2 drilled 50x3 3/8 x 35. I was thinking  of 50x 4 x 40 on the Big Bang. What can I expect from this with this drilling and box surface? Any input is appreciated.

Thank you