Rolanberry Fields (S) offers a good solo camp at the pond at J-10. 8 slug pops on 5 minute respawn timers with no penalties to physical or blunt damage, unlike other Amorph mobs.
Bostaunieux Oubliette doing Page 4 of the new GoV tome their taking out one of the 40+ Bloodsucker mobs will make fast work of this trial. Also gives the benefit of doing a minimum of 33 pages worth of xp, tabs and gil from the kills.
Abyssea - Konschtat flux #6 will land you near the flans and leeches area. You can either kill leeches only or alternate between them for extra cruor.
Worm Party in Abyssea - La Theine