Soloed Snoll at Pso X'ja with BLU63/NIN31. Dont remeber the position of the entrace but was an uncapped one and 2 Snoll are bottom of the stairway.
Use headbutt to avoid the "explosion" they do and stoneskin when he cast cold wave (DoT are nasty).
Just down him under 50% fast as you can in case you get surpised by the explosion (similar to self-destruct exept is ice dmg) and keeped utsusemi up almost all the fight exept under 15% to let him build TP faster.
Wish that can help you.