I am 50 in all DoH as well as Btn Min and just one DoW. DoL leves were the most useful for leveling, DoH are good, battle leves are a waste imo. Evaluation leves with BiS gear are extremely efficient, and pretty easy. I don't think it's a bad idea at all to have a gathering class as your highest.

If you're going to gather to level, i suggest figuring out what is the most valuable (regardless of what you need) and selling it, so you have gil to buy whatever you want/need, and sell you treasure maps!