Grinding herb cave's level 65 mobs?

You usually go down to the left and grind herb cave's level 51-55 mobs, but in the entrance of the cave and when you to the right there are level 65 mobs. What about them? Cant you go to an empty lobby and make 2 parties with 15/16 people each, level 40 people grinding level 50 mobs until for example lvl57 and then go up and grind lvl65 mobs until 66/70/76??? or the mobs dont give good xp???

 

herb is extremely bad i dont know why you would even bother bringing up the thoughts of doing it

also after some level waterfall and literally any other grinding spot in existence outclasses herb by a massive level so..

 

what lvl is waterfall

 

personally does it at around 70 and when im levelling i just rush idol cave