rushed through normal/epic with petmancer build. absolutely love the mod, thank you for reviving this masterpiece!
here are a few notes/suggestions/wishlist:

-in general i'm totally satisfied with act 1-act 4, haven't touch ragnarok and atlantis content before SV release - they seem lacking right now (I understand there's work to be done, heroes to be added etc)

-act 2 Telkine brings a spike in challenge compared to other content (please don't change that)), so I would suggest making nearby areas more suitable for farming (valley of kings tombs) - could you add more hero encounters / overall raise mob difficulty, since this zone becomes to easy to clean way before Telkine can be approached with decent strength.

-about other 'farming zones' - for me its: Parnassus (good mob density, good hero to monster rate), Labyrinth (same), Valley of Kings (act 2 before Telkine), act 3 seems to be filled with them and I consider it 10/10, but here are a few favourites: marduks temple, great wall (between the wall and the portal), wusao mountain - featured zones spawn top heroes with best souls imho.
so I suggest raising spawnrate of heroes/elite groups/ubers in those areas.

-about uber spawn rates: there are some bosses that spawn more often than the others, like: Calybe, Rakanizeus, Elephantsnatcher. Rare ones I encountered once-twice at most are dark nymph (act 3, been farming moss elemental so a decent amount of time, only seen her twice), blood crow (act 4 machae (?) archer is pretty rare, bloody eyes (ratman uber) super rare)), act 3 wusao mountain dragon boss (mother of flame or something, can't remember). never seen Permean Extinguisher - can someone confirm it spawns in act2? act 1 outsider boss (Melalos or something) - pretty rare (or spawns only in one-time-pass areas like Catacombs). in current version of the mod all bosses seem to be pretty killable, so is there a point in making those encounters more reachable? would love that.

-about shrines: could you add more/improve existing ones? right now only Battle and Mastery shrine seem useful; thorns, frostbite and healing are almost always avoided)) I'm thinking Path of Exile style shrines: Frostbite shrine casting frost novas around player instead of flat cold dmg; maybe Zeus shrine giving chain lighting on hit to attacks; always crit shrine; Hellraiser shrine giving flat fire dmg increase + meteors falling around player; Necromancer shrine spawning skeleton minions for a short time; Monster shrine spawning 3-5 random heroes + elite group of the act.

-and of course more heroes/elites/bosses/mercenaries are always welcome))
about adding new mercs: are there plans to add more to starting acts (normal) in the future? thing is, I don't enjoy twinked runs, but the hero souls sometimes so good and build-defining that I just have to create new character and play again through 1st zones)) I'm thinking Minotaur melee/support for act1 (white skinned, buff auras), Reptilian caster for act2, Tropical spider (crowd control, vampirism) and Neanderthal rider for act3.

thank you for your attention