Offhand is normal hc garrosh, and regarding the gems, I still need my frost spec to be somewhat viable, so I'm going for the 13629 haste point (which for goblin is the 14242 point) which is fine, but I find myself forging out of haste to hit for example (I have bboy hc wf) so instead of setting the haste BP, I would gain 1600~ haste (15455) and lose 480 int, but since you said theres not much point going above 13163 I'll assume that means I'm better off sticking with the int.
Cheers.