Was the bug where units other than cannons do damage from the backrow fixed? In 1.22 this bug made deliberate back-row infantry a viable choice.
yes, fixed.
When combat width is 24 I usually run 12/1 stacks and combine for battles. For 25 CW I add an extra infantry. When considering cost, should I be running 1 more or less cav, or keep the same comp? In other words, would adding 2 more cavs to a battle save more money than not adding them?
Early on, for rebel hunting or wars in general you should try to make stacks that have equal amount of infantry then the combine inf+cav of enemy stack, then add 4 cavalry to that amount.
example: if enemy stack has 16 inf and 4 cavalry, you should go for 20 infantry and 4 cavalry.
YOUR cavalry will flank then, and THEIRS won't.
its micro heavy, but enemies and rebels MELT if you take time tomicro stacks before doing a battle.
more then 4 cavalry is situational useful (hordes, nations with cavalry bonus combined with rolling in dosh).