It's too late to reverse the power creep. Riflemen, Sections and Conscripts all got significant buffs within the last patches. At this point, the only option is too buff Grenadiers, otherwise you'd have to adjust all of the above units instead of just Grenadiers.
It is allot easier to partially revert changes than to introduce new ones. If value A was buff by 100 and it now OP one can simply lower to 50 and see what happens. If it to low one tries 75 if it still to hi one tries 25.