I see, no problems. I just used placeholders. The game also crashed when I tried to build Eagle rider. Ini files seem to be referencing Wild Griffin, but the actual sounds are located in Griffin Rider folder.
I am playing as European Wizards, so far so good after 250 turns. Good guys seem to be way stronger then undead. Irrigation is a game changer. Dwarfs seem overpowered to me, since they have both access to irrigation and mining. Wood elves are also strong, since they can plant forest, which can compensate lack of mines.
It took me around 200 turns to realise, that you have to build 3 taverns to be able to build Town Hall which allowes growing beyond size 6. I should be way stronger by this time. I am second after Canadian Dwarves in score (sorry, can't remember actual civ names).
Reducing number of harbors worked very well. Now the game is fast. However, magical portals do the same. I think, you could tie them to some resource (mana or crystals) too. Speed is managable for now though.
There are still issues with unit balance, howerer my army is way more diverse compared to undead. Fast magician units upgrade to slow wizards and the only fast unit left in middle era is Wise one, which is only A3. I managed to trade for elephants, which made situation better, but you rarely could take elephants by yourself, since they are only found way south. There are problems with air units. Great Eagles are simply the best and one of the cheapest units. With ROF 3 and 15 bombard and lethal land bombardment they can kill any foot unit in one go. Firebird looks like the best interceptor - better than eagle rider or griffin rider or royal griffin, but at least it is expensive. Flying castle looks very cool, but it is no worth in building it, unless you don't have nest resource. It has weak A/D, low range and only 1 RoF. Civilopedia mentions them having lethal sea and land bombradment, but they can't destroy land units. Dragons look worthless. For their shield costs their stats are underwhelming. Stealth is nice, but I could simply build 2-4 eagles instead. They also have lower RoF. Bombardment is good, but with low defense of the lategame units they are not worth it either.
I have a very bad luck with hardwood too. It disappeared 3 times from my territory already. I suggest that you make at least one naval unit which doesn't require any resources. I was able to build ships only after discovering navigation (cannon cogs do not require hardwood).