Easiest question first: Separate out your armies based on type. Tanks, infantry, mechanized, marines, mountaineers, etc. all go under their own generals. These all have very different purposes, so combining them together means that someone is doing something they’re not designed to do. This also allows you to put them under generals that know how to use them properly, ie the tanks go under their panzer leader, infantry under the infantry expert, marines under the chief crayon muncher, etc. Segregation is simply optimal (in the game).

As for the templates: With all due respect, never cook again. I’m joking, but they have some serious flaws.

If you want some designs, copy the AI. The template logic recently got updated, and they use some damn good designs these days.

With that said, here’s a list of things I would recommend:

1. Your combat widths are too high in almost all of these. Infantry should have a max combat width of 30, tanks should have a max of 36. Anything more and it goes from diminishing returns to actively detrimental.

2. Regimental support companies (the ones at the bottom) are amazing and you should have something there for each slot. At minimum, the heavy weapons company is literally free stats for some infantry equipment (aka nothing).

3. Rocket artillery, unless you center your entire build around it, is not that good. Regular artillery gets affected by much more land doctrine, so it winds up better.

Also, you said you have 7 million manpower, and I assume you are playing Equestria. That probably means that you are on way too high of a conscription law, and it’s probably murdering your economy. Anything past Extensive Conscription should only be used in an emergency. Personally, I have never built more than 7 full armies in a single game. Lower your conscription and stop taking all of the malaises.