Heroes 5.5 WarGame Edition - Tactical Edition.

It's already spread out; Knights appear later in the tech tree (because they are stronger overall).

Added 23 minutes ago
I calculated the balance of human unit growth according to the scheme.

Growth rates:
Militia 150 x (10-30) x 2
Archers 250 x (8-24)
Swordsmen 400 x (5-15)
Monks 600 x (5-10)
Knights 1000 x (4-8)
Griffins 1000 x (3-6)
Angels 3000 x 2

Fort, Stronghold: +100% growth rate for tiers 1-3
Castle: +100% growth rate for tiers 4-6
Upgrades: one-time increase = current growth rate (enhanced by fortifications)
Farms: double the growth rate of corresponding units (militia)

Training Grounds: training (upgrade) is free, limit = 8 units per week. This is done so that the limit can be reduced to reasonable levels (to prevent Knights from becoming too powerful), but at the same time, the building remains relevant and strong.

Maximum possible number of units hired by the second week:
Militia = 10 (base) + 10 (growth) x 3 (Stronghold or Castle) x 2 (farms) + 10 x 3 (upgrade) = 100 (total cost 15000)
Archers = 8 + 8x3 + 8x3 = 56 (total cost 14000)
Swordsmen = 5 + 5x3 + 5x3 = 35 (total cost 14000)
Monks = 5 + 5x2 (Castle) + 5x2 = 25 (total cost 15000)
Knights = 4 + 4x2 + 4x2 = 20 (total cost 20000)
Griffins = 3 + 3x2 + 3x2 = 15 (total cost 15000)
Angels = 2 + 2 + 2 = 6 (total cost 18000)