I don't mind you editing the mod file and testing things out at all.
What do you mean about the attritive power of Nether Darters? Do you mean throwing a bunch of the priestesses at the enemy with a chaff screen, Darting them and then coming back for more after they die (assuming friendly dominion)? Okay, that's something to look at, but it's not much different than tossing a horde of thaumaturgs at them, since you can get those anywhere for cheap. 5x Darts and run is still brutal.
The clam issue I did not think of. That can be a problem, but I don't see an easy way around it unless a change to the randoms is made so it's 100% SDN random and the 20% WSDN staying as is. That way only 20% of them are W2N and need a bracelet before clamming. Can't remove the fixed Nature without screwing up the thematics and even changing the random changes the symmetry between the Renatus and Renata, but as you said, it can be a serious balance issue. Astral nation, undead reanimation, immortal thuggable commanders and easy clams all in one package would be a bit much, I suppose.
Thanks for the analysis!