Hey Wes,
I've very much enjoyed the two games I've played of your mod. I've found vanilla Civ5 (after the patch) to be in better shape than Civ4 was in terms of the issues that concern me and inspired me to make HephMod, but your mod takes these things a step further. Longer playing time in ancient eras, a rational and more historical military unit progression, etc. The five-unit per hex limit makes moving your units SO much less tedious, and when you actually fight, both I and the AI tend to fan out our units anyway to create fronts with zones of control and flanking bonuses, so the tactical interest that 1 unit per hex creates is mostly retained in my experience.
The one area I think your mod unbalances, however, is happiness. I liked the happiness changes they made in the patch, as it was too easy to keep people happy before. The patched Civ seemed to take away happy buffs from luxuries and buildings, but built in more buffs to the social policies to compensate. In your mod, you've brought back the old happiness buffs, which now stack with the new social policy buffs, and people are just way too happy. I just don't have to worry about keeping people happy and can expand more or less to my heart's content. I wondered why you made those changes, and then I saw in this thread that you play on Emperor level and the light bulb went off! I don't play on the higher levels because I just can't stand seeing WWI armies running around during the period of the American Revolution ... since your mod reduces research, I'll have to try to play at your level and see how it goes!
Thanks again for this great mod ... if a Civ 5 HephMod ever gets made, be sure that I'll be ripping you off big time!
EDIT: Ooh, just noticed that units DO get the flanking bonus when stacked. I would consider lowering the flanking bonus down to 5% per unit or limiting stacks to 3 units instead of 5. I just attacked an enemy unit that was flanked on one side by a stack of five units and on another by one unit and got a 60% flanking bonus! On the upside, the AI sure does use stacks to its advantage: I just saw France "echelon" attack a city with wave after wave of warriors.