I don't understand why they reduced rank B HP. At the first day of patch 2.3 i knew nothing about hunts, met lvl 50 monster (Stinning Sophie) and killed it. I was pld50 with class-job gear only equipped. The only ileveled item i had was i70 sword. I killed it solo in 7 minutes with my rank 8 chokobo as a healer.
So, single players could kill rank b alone with chokobo assistance before 2.35 w/o aid of other players, but there was no reasons t do this - much time, risk of death, etc