Hi all,
Thought I'd give a sumary and some comments on the discussion so far.
I'll stick to veteran units for the sake of comparison. I add the cavalry charge bonus if applicable.
Limit of 4 units to a group, keep things the same.
Light Infantry 10 Heavy infantry 14 Light Cavalry 10 Heavy Cavalry 16
Pros: Limits the CF
Cons: you lose the large group rules for commands. Factor difference between some units is still high. After losing 1 stand, the group is at a severe disadvantage.
Limit the group to 4 and front rank CF back rank support
Light Infantry 12 Heavy Infantry 16 Light Cavalry 12 Heavy Cavalry 18
Pros: It forces you to pick strong units for the front. the back units can be common. Historically accurate deployment.
Cons: The points spread is the same. The larger factors ensure that there is no slaughter. Slaughters become pointless with fewer stands and will usually ensure a complete wipeout. Loss of command rules for large groups. After 1 stand loss, the group is at a severe disadvantage.
Take CF + support +1 per additional unit.
4 stands Light infantry 8 Heavy Infantry 10 Light Cavalry 8 Heavy Cavalry 12
6 stands Light Infantry 10 heavy Infantry 12 Light cavalry 10 Heavy Cavalry 14
This seems to work well enough with a limit of 4 or upto 6 stands per group as it scales linearly after the first supporting stand.
Pros: Minimal rules change. Lower factors on the low to high end. Gives light infantry a chance to win without diluting combats.
Cons: A bit more complex calculating combat factors. Possible to use common troops as filler (not neccessarily historically inaccurate BTW).
Chariots
i'd use the double support when charging and give the group a normal charge bonus.
Group of 3 would be C 4 S 2 so the total would be 8 + 1 for charge bonus 9.
Pikes
I like Mike's rule a lot. Use the phalanx as a defensive formation. It gets a charge bonus of sorts when charged by non-pike units. +1 for 1 rank, +2 for 2 ranks.