I can recommend trying my mod, that explicitly seeks to address this issue and some other problematic balancing problems.
steamcommunity.com
Unit upkeep attrition 0.01 #Constant attrition value applied to armies #defines
Attrition from terrain: #terrain
forest & hills: 0.1 (from 0)
plains & urban: 0.1 (from 0)
jungle 0.4 (from 0.3)
desert 0.3 (from 0.2)
manpower for INF & CAV 1200 (from 1000)
manpower for MOT & MECH 1500 (from 1200)
Reduced reliability for equipment
Inf equip: 1939 0.8 (from 0.9)
Inf equip: 1942 0.7 (from 0.9)
Economy and manpower laws: the idea behind these changes is to make it more costly to militarize society. War economy may require measures to improve stability, such as improving working conditions. Conscription laws reduce war support, so will require propaganda efforts. This enhances realism and prevents some PP bloat.
Mobilized economy now hurts stability and costs political power (PP) #economic_ideas
Partial: stability: -5%, -0.05 PP
War economy: stability: -10%, -0.1 PP
Total mob: stability: -20%, -0.2 PP
Conscription laws reduce war support (WS), cost political power (PP), and reduce factory output and construction speed. Less manpower from the last two laws. #manpower
Extensive conscription: WS: -10%, PP: -0.1, factory output: -10%, construction speed: -10% (from 0%/0%)
Service by requirement: WS: -20%, PP: -0.2, factory output: -20%, construction speed: -20% (from -10%/-10%)
All adults serve: manpower: 15% (from 20%) WS: -30%, PP: -0.3
Scraping the barrel: manpower: 20% (from 25%) WS: -40%, PP:-0.4