I'd suggest pairing a gathering job with a crafting one.

I was able to attain lv 50 cul with help from my botanist job but gathering jobs take longer to level then DoH jobs. Always try and keep your gathering higher then crafting to offset material acquisition for your crafts.

Most crafting jobs you can get to 15 easily by sitting by the vendor in the crafting guild and making the level 1-15 items. I'd suggest doing this for all the crafting jobs because the cross class abilities you get at 15 are quite good. Leveling each craft to 15 will also get you a lot of shards by completing the classs quests which is easier then farming them.