As a summoner you actually have to plan your mana conservation throughout the entire phase of every fight in a instance like coil. The BLM's can go willy nilly. Enough about bane though. Though I'd love to have it fixed, as well as pets benefitting from stats and potions. My real issue right now, you have a DoT based class, with a complicated rotation (in comparison to something like blm, dragoon, etc.) and you make it way harder by letting DoT abilities refreshed with sub 5 seconds remaining bug out and not refresh the duration of the dot. I cant tell you how many times I've gone to reload my bio 2 or miasma and it not take effect because of this. It should have been fixed before we even got to launch; let alone still being an issue months later. I was the first lvl 50 on my server (Goblin) and have been dealing with these issues with summoner since day one.
Cheers,

Baliso