with a mnk and whm duo it will unlikely happen. nin + blm is a different planet
i repeat, i'm sure mnk is a great choice for some kind of NMs, but for farming, i'd definitely go nin
and i repeat again, no need for a huge hp pool when you're hardly taking dmg and what can oneshot you nets you a sweet 0 dmg
as usual everything is situational, i just state that nin is a way more versatile choice