As soon as I reached 25 I went to Ordelles Caves, upper level where there are holes to drop down to Stroper/high level gob rooms. In one of the south rooms there were 2 seeker bats. I would take the lower level and send it against the higher level, and help fight if necessary.
Then after they were dead, I would grab a vorpal bunny and use against Dung beetles (also farming beetle jaws). I avoided the jellies in the other south room. They start at level 26, but they are insanely hard to charm. I just kept cycling the spawn areas here, nothing aggros (except jellies and bats), only link, so you are really safe. Bring a couple of silent oils and prism powders to get you to the room, as you have to pass by quite a few gobs and hognosed bats (yes they still aggro at lvl 25) I leveled here from 25-26 very quickly, then I went to Qufim and started on worms using seeker bats or crabs as pets.
All that being said, you could certainly stay at Buburimu longer, and start fighting Pugils (24-28) but everything else would be EM or less, so I prefered to leave.
For directions on getting to the Ordelles camp, go here:
http://www.ffxi-atlas.com/ click on Ordelles caves, and the camp is the map on the lower left, where the 4 dots are. Go up the stairs past the hognosed bats, and you will see the Vorpal bunnies.