Hello! I recently started leveling Botanist. Its my first gathering job that I'm trying to focus on so I have a few questions:

I just hit 22 and I've been logging @ the lv20 camp since 15 or so, but now the exp has slowed to a crawl. I'm assuming leves work like battle classes where I wont be able to go to the lv30 camp until 25? I would just go to the next area and start on grade 4 logging points but the next Arbor Call ability doesn't come until 28 if ZAM is to be believed. So am I stuck with grade 3 logging points until I hit 25?