Second: I think the spearman-buff should be reverted. While at 7 strength they are somewhat less hammerefficient than warriors, they do offer more strength per gold maintenance (unless there is fractional maintenance?). The reason it was useful to build warriors instead of spearman in the unmodded game was the ability to mass-upgrade them to swordsman, but I think this has been nicely adressed with the scarcer resources and increased upgrade costs here.
Also, while it is true that high percentage modifiers can change the odds of horseman vs. spearman to favor the horseman, this does not take into account the substantial cost difference between these units, which still makes the spearman the most efficient counter to horseman.
Now, I don't think spearman are really unbalanced at 8 strength, but I don't feel the buff is necessary, especcially if it also has adverse effects: By buffing spearman, you also increased the unique units and then had to nerf hoplites quite substantially (which is somewhat ironic, since they actually were as hammer-efficient as warriors in the unmodded game).