So I am seeing some shamans crit with LVB for 15.5k

How is this possible? I am critting for around 8.5k right now and was wondering how should one spec for overall dps in an instance and pvp. I know there is a difference but what is it?

Does speccing into hit increase spl dmg?

Please let me know. I never really got into these things as running 5 guys is a lot of pew pew but now I really want to increase the dps as much as possible.

thanks in advance!