I use both Skinning and Mining.
I did have Skinning and Herbalism like you did but I decided to drop Herbalism after much contemplation. It was mostly due to the fact that I always ended up FCing (not that I don't mind) and I thought that the extra Stamina would be more viable, as well as the extra crit(Skinning) over Herbalism.
Anyways, Herbalism only benefited a few of our spells, Lightning Bolt, Ghost Wolf, And Healing Wave, while the extra Crit from Skinning will benefit all of your spells; Lightning Bolts, Shocks, Searing Totems, Lightning Shields, Healing Wave, etc.
I don't regret my decision of dropping Herbalism at all. Most of the time you're Shocking and the extra crit plays a big part in that while you're also being viable to your team by throwing out Wind shears/Totems/Purges, etc. As we both know popping Herbalism and spamming Lightning Bolt can be effective, but it really isn't our role in this bracket >.<
Hope this helped in making your decision!