Good points.
The one true unique british infantry upgrade is their squad size, and it's kind of part of their identity. The main reason I nerfed the base infantry and lowered the cost of the squad upgrade is to balance the british infantry around them being 5 men. I wanted to make people buy it early on.
Brit squad size upgrade is probably the MVP of the optional upgrades. The upgrade could use a manpower cost reduction (you are paying for the 5th reinforced member after all). However, making the upgrade too cheap will turn it back into a no-brainer.
One way to more consistently balance around the upgrade is make fresh squads always come out as 4-men squads. Thus, if you want 5-men squads, you always have to reinforce.
One way to balance this upgrade is the follows:
- Suppose that the worth of a 5-man Tommy squads is 280 (at 28MP / model)
- This would make the worth of 4-man Tommy squads equal to 224MP
Now:
- Change the cost of 4-men Tommy squads to 252 MP (or round it up somehow)
- Every time the player summons a (4-man squad) they pay 252MP.
- If the player wants the squad bumped up to 5-man, they have to pay 280 MP (summoning the squad + reinforcing)
Alternatively, another way to make the 5-man upgrade more appealing is:
- Change the popcap cost of vanilla 4-man Tommies (and sappers) back to 7 (like the live version)
- Make the 5-man upgrade reduce the popcap requirement of Tommy and Sapper squads by 1, so that 5-man squads have a popcap requirement of 7, and upgraded 4-man squads get a popcap requirement of 6.
PS: Another thing that affects infantry combat but doesn't show up in the stats at first glance is an additional 0.9 received accuracy modifier applied to all Brit infantry (Tommies, Sappers, Commandos), while those units are behind cover. I don't know if you intend to keep it or not.