I found that around the later edges of the game in Tactician I was forced to use a lot of cheese. For example in the massive ruined city added in Epic Encounters, I was forced to send my lone wolf tank forward and tank enemies turns before even including my Mage and Archer in the battle or if I did have invulnerability pre casted on my Mage, this was due to the fact that the enemies always got first turn (40 initiative vs 27) and in their turn especially the stealth master enemies would instantly gut my back line and force me to load. It might've just been me underestimating the game and maxing damage (because mobs took 2 years to kill without Crush on it) so I was punished for having low con on those characters. However I highly doubt having +800 more hp would save my Archer from being hit for 1000 and then have enough AP to run to my tank and hit him 2 more times. I don't know if it was just a shoddy build but some of those enemies felt quite unfair. Void Travellers come to mind with their massive lightning attack that every single one did at the end of their turn.

To be honest I think if you want enemies to deal that much damage you might need to tone down how much movement they have per AP. They can run right to an Archer at max range, kill them in two hits and run back to the tank and hit him once. Same sort of sentiment for the Vampire assassin enemies.

The very first fight of the game was also impossible without having Lone Wolf on one of the characters. I tried 7 times before giving up and making double Lone Wolf characters and respeccing when I got to Cyseal.

Banishment might also need a damage buff, some of the caster mobs in the Void Dragon fight that were eligible to be Banished were able to survive the hit with about 30% hp left.

I would also like to point out that Maradino was probably the hardest fight in the entire mod, without decaying touch I had to abuse pyramidding outside the closed door and spam flee/running back Hail of Arrows to defeat Maradino as the healing output from one of his adds was just insane, and even then I had trouble grinding through the huge hp regen from 1 turn Regen spam that healed for 1900 a tick so 3800 a turn.

Only other thing I can think of is a request to increase Astarte's health, having the Void Dragon kill her in a series of breaths after leaping to her western side was very frustrating.