@Morgawr I think the mod is simply optimized for the typical continental blocky maps (since
@notque mostly uses those in his autoplays, I assume?). Or maybe it's just harder for some water-oriented civs? Not sure.
Anyway, the base AI has always looked better to me on Fractal than on Continents (possibly because it values coastal settlements highly) - so the difference in performance is still there, but gets smaller.
You could go for a large fractal map (with Gedemons mod), I guess? Looked good to me when I tried it and would give the AI more continental space to settle (but probably result in fewer wars?).
There are other settling preferences the mod changes / flattens, so this is more complex than this one dimension. And it's not based on hard data (just what I think I'm observing).
(And: FXS may have shot themselves in the foot by releasing these blocky "balanced" map types first, but that's a different issue.)