On the grind areas I would say keep a lot of the existing ones as they are.
Especially in Krynn!
IMO Krynn bent some unwritten rules back when it set-up the uber areas.
And the players loved it
Looking at Krynn it has 3 of the team top grinders Ice,Quali & Mithas.
Plus centaurs for solo.
And war plains for vast numbers of enemies, relative safety to flee and decent exp.
And haven dwarf camp. (protected?)
And Kalaman for solo. (protected)
And Neraka for solo. (protected)
Plus lots of new weapons etc
I like to see all this in Krynn but it sure left a lot of other domains behind.
If a Krynn grind train has downtime between areas too bad.
Go and clear a plain, attack Neraka. Etc
Let some other areas balance out the Krynn curve and align themselves by balancing exp they offer.
I don't think for example Mithas offers a team any better experience than they would get killing bicorns (given how fast a Mithas team would slay bicorns).
It is just the fact that Mithas respawns fast enough to keep them busy for an hour or two. Bicorns is a dangerous area given the holm is free for all. But if it reset fast it would be a great choice for all willing to risk the holm.
Ogre caves is good, but a bit more difficult than enter room kill all next.
Good! Make that type of killing worth a lot more exp.
I don't think anyone every goes to the albus level of those caves.
Its like a smaller ogres fight.
Not sure how it rates in exp compared to gont guards.
Its cool check it out.
Raumdor forest is a big area that is a little challenging given the debuffs.
But no one ever goes there.
Maybe if through preparation they could protect from the debuffs they would.
Revert Trollshaws back to pre nerf, same with Edoras.
(Why nerf them in the first place given what Krynn offers)
Up Kabal exp to match Gont.
Make Kabal elite guards auto hunt again, not inescapable, just enough to get your blood pumping. Fighting these guys in darkness (so you cold manage because they were so tough) was the uber exp back then.
Make the North Gont Karg Caves npcs about 2 x bigger give the boss npc an upgrade from the unholy halberd + golden armours.
Change all the harradrims camps (there are 3) to match the exp of the of the newest south camp. (It not like we are being small player friendly to have sucky harradrims because it is still an area protected by MM and AA)
Make the Ithilien ranger/orc camp bigger and on a par with harradrim exp.
Have a look at Isengaard a huge existing area and see why people are not going.
Moira could go deeper, would be code could be written where you could just keep going deeper without end until you were finally forced to flee. Deeper levels more exps, but trolls hunting you ramdom attack etc