First thought is that jug pet use really wasn't all that common at that level range with Charm fighting being the go-to level method. Come 75, in the old days, with the right gear and merits, yes, it became more viable. Fast forward to Abyssea and pets like Nazuna became viable with the same gear, new options like -PDT magian axes, and atma affecting pets, too. Come Adoulin, Charm works on some things again, but the max level of jugs are also limited to the old gear/merit options and are in need of some (pending) work.
Basically, your options are to craft or just slog it out until the 75 phase. You might even have to self-craft post that, though. Not much you can do about it due to BST not being a popular job and the general neglect it and others have seen over the years. If you're dead set on solo leveling, I'd say head to west altepa and get the FoV page for beetles/cactuar kills. Charm beetles and do your thing. Eventually you'll be able to charm scorpions and it'll get faster. This can take you to like 62, but it understandably slows down in the late 50s. Some old BST solo guides may apply, but mob placement changes way back have also killed some camps.
Edited, Oct 26th 2013 12:53pm by Seriha
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