Since you decided to level all of your crafting and gathering at once it might not be an option, but personally I just look for leves that require cheap items, or give the most exp. I either craft or buy (or just have in my inventory anyway) a bunch of that one item and do the leve over and over. HQ very much preferred, but they give great exp either way. This way you don't have to have ingredients to make a ton of different things at all times.