More Armies

Line infantry, artillery and dragoons.
Hakbukan, LMAFOs (or Bombards) and a flavor of missile cavalry for the rout.

I tend toward a main line of Hakbuts and either Greatcannons or Bombards, with 2 of halberds or something to block enemy flanking cav.
Always have 2 or 3 outriders w/grenades if I can, the only vanilla unit I always include.

That said I've got a lot of variance going on- volkmar's rolling with 3 handgunners (with extra powder upgrade thru a unit upgrades mod), 2 bergjaegers, deliverance and emperor's wrath steam tanks (unique steam tanks mod) 3 greatswords, 2 war wagon units, a pistolier unit, (all in his army when he confederated to me), and 4 great cannon

It's pretty potent, especially in sieges

I usually run a mainline of 5 Hakbutschutzen and 3 Great Cannon units. I position the infantry to either side of the great cannon units.

Then, out on the flanks, I usually run two units of Bergjaeger on each side of the line to handle the inevitable flanking cavalry.

Behind the main line, I usually run three units of mortars, and three units of Helstorm rocket batteries.

After that, it's whatever suits your fancy for a few specialist units or heroes.

So the enemy gets chewed up by a ton of artillery in the charge to your line, then they get blasted by the infantry. Half the time not a single unit manages to engage in a melee before getting shredded.

Hard difficulty campaign/battle, i'm running a template 20 stack for most of my armies that keeps looking the same for around 70 turns or so:

1x Lord (sorta need one for an Army.)

1x Engineer (You 100% need to capitalise on the engineer buffs.)

8x Hakbutschen (they're the core and the mainline in the army.)

2x Thrice-Pistols (With some upgrades from tech, elsbeth -and Imperial armoury though not neccesarily required- these become the perfect mixture of shock/missile cav)

4x Artillery guns (Usually 4 mortars. Usually gets exchanged for rocket artillery and the lonesome Great Cannon if the need arises, but 4 mortars will do the trick for the first 70 turns or so.)

2x Bergjaeger (designated anti-large.)

2x Variety (Whatever unit i want extra or i feel i lack in the current war, these do always become tanks / landships the moment i unlock them. Plugging in 2 field engineer units for this has paid off nicely before as well.)