I haven't played Magister's mod, so can't comment on that. I do remember that in regular FfH2 it was one of the patches, I think patch h, that merged in the AI from Wild Mana (as it was called at the time) and resulted in the AI building monster stacks, much larger than it used to. Although Kael did issue more patches after that, the SoD problem was never truly fixed, as i recall. Someone also mentioned increasing inflation. I know Kael reduced inflation in FfH2 compared to BtS. I don't remember if he offered a specific reason, but BtS has many more late-game buildings to boost your economy, unlike FfH2, so that might be one reason for a lower inflation rate.