30 figures per side for The Pikeman’s Lament gives a perfectly viable game, Frank, if you stick to the smaller infantry unit types like Commanded Shot and Forlorn Hope (6 figures per unit, which is the same for all mounted troops). Larger bodies of pike, shot and so on are in units of 12.
Fistful of Lead is at the other end of the scale, and only requires five or six figures per player. They are very entertaining rules, particularly if playing with a group of friends, each controlling half a dozen figures. Much of the business of the game is derived from cunningly playing the hand of cards you are dealt in the optimum order to activate your figures one at a time, and also to make the most of the particular benefits yielded by certain cards. I think that central mechanism of the rules might prove slightly less entertaining if you’re playing both sides, but I haven’t seen the solo play sheet, so maybe that provides a way of maintaining the suspense