Within the first few weeks of the release i got most of the classes leveled up 5-10. Then started working on my 3 favored classes (CRP,FSH,ARC) at about 14 i noticed a great deal of CRP's surpassing me. I decided it would be better to just stop and focus on FSH, as i did not have a great deal of time to play.
Since i no longer have a serious motivation for CRP, and i can repair my poles, i sell my shards for gil and use it to upgrade my gear.
like others, the only real time i exp on my DoW class is if someone in my LS makes a group. maybe once every two weeks ill grind ARC for 5-6 hrs.
So far i think i have made better progression focusing on FSH and leaving everything else in the dust. I have 1.5m, decent gear, and a good LS to carry me through the high lvl guild leves.
(as long as i sell my shards and fish within the LS

)
to be honest i don't see a need to level a DoW/DoM class for DoL.
at least not at this stage in the game.
Personally after i get one DoL class to 50 i will focus on a DoW/DoM.
Also i found if i get lucky with my path/dowse i can outrun most aggressive mobs. I have fished in some dangerous areas, but i usually die a couple times getting there. if you stand at a distance and watch the pathing of some of the aggressive mobs you can usually find a small spot to fish between them with no aggro.
Bait the mob out by hitting the farthest distance of their aggro range, lose them then use that window to sneak in to the dangerous fishing spot.
yes i know i tend to ramble on, tl;dr