no lv requirement actually..
they say lv 180, cause after lv 180 u are suppose to be at half way making ur char's build, so u are quiet strong... but depends of ur build..
also,

winds have no con, or at least have low con, u think they wont do fb cause dont have 2.5k hp??

sure, with 3k+ hp quest gets a bit easier, but still, team leader wil def, so hp isnt a matter.