Very impressive work of modding, it already improved the game greatly, and in such a short time. I do have five points of feedback from my successful empire long campaign.

1. Toward the end of the game there is simply too much money, and too many lords. Combine that with the in detail lord management and I simply stopped tracking of items and retainers on any lord under level 10 (which were about 2/3 of them). Leveling was also a bit tiresome at that point.

It seems balanced in the early game, however. I would recommend adding a more hefty maintenance cost to the later game units you added, they are extremely powerful and would make a good money sink, gotta pay for straight-up upgrades, after all. Given the higher unit density, it might be worth buffing village and city defenses slightly. Is it possible to add a gold cost to buildings, that might also create a nice tradeoff?

2. I concur with others that magic is underwhelming. It looked cool, but the damage spells generally didn't do much to enemies, often not noticeably reducing their health bar for a direct comet hit. I think magic needs a serious boost, since it requires at least one unit slot for a wizard plus levels. Buff and debuff magic seemed quite useful, however, so it's probably just the damage spells.

3. Faction balance is a bit off. The vampires were utter pushovers, and barely expanded in the 100 turns it took me to decide to deal with them. This was on Very Hard difficulty, and I struggled with my fellow empire factions and Dwarven factions quite a bit. One empire faction managed to grow larger than I was for quite some time until chaos happened. I'm not sure what is wrong with vampires, but they were struggling a lot throughout the whole campaign.

Speaking of chaos, it needs a serious buff, or something else needs a nerf. The unit composition choices were quite miserable, even on the ever-chosen. I rushed troops north when he arrived, only to watch him murder himself on a city with only two generals defending it. (He was attacking with four, and we fought outside the city). He only marched out of the wastes with roughly 7 lords, which meant he was doomed since I had something like 23 lords at the time. Equally the earlier chaos incursions barely dented the AI or myself. I think the problem is composition and numbers, but as I said I think late-game lord numbers get a little too high.

Orcs and Dwarves seemed quite balanced. They were still battling back and forth when the game ended. Dwarves were winning this time, but it didn't seem like an uneven contest.

4. Lord progression was very solid, the two points seems like a good change, though perhaps reduce the sudden increase to 3 in the later game. It is a good thing to need to specialize lords, at least preventing them from maxing out every tree. Overall, however, the empire lords worked well. Building balance also seemed solid and interesting, I loved the tavern change, and it was quite well balanced.

5. I love the longer melee, it seems very well balanced and tuned, and is quite enjoyable. Morale is . . . interesting, and I rarely saw units retreating, leadership seemed less important than I would expect it to be. Perhaps lower the leadership on some of the lower tier units? It would be nice to need leadership on my generals, though of course empire tends toward great leadership already. Overall I love the grindy feel of melee, it seems balanced almost perfectly in terms of damage.

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Thank you for creating a great mod! Speaking as part of a modding team myself (I'm Malorn on the MEIOU and Taxes mod for Europa Universalis 4), I'm amazed at how much content and work your team has produced in such a sort time. If you'd like to follow up or ask me to clarify anything I talked about above, feel free to message me on steam. Regardless, thank for putting such considerable effort into creating such a solid gameplay improvement with this mod.