Just my 2 cents...
100% income.
10F for start.
Med HQ - 200MP/50F (MG34 - Kubel doctrinal for 0CP, Lieg, Searchlight, 251/17 Flak)
Mec HQ - 200MP/80F (Luchs, Puma, Stuka, Obers)
PzSchwerer HQ - 200MP/120F (requires Med HQ and Mec HQ) (Panzer IV, Panther, Jadgpanzer)
Volks - small damage increase along side with reinforce increase (with 100% income we must avoid MP float)
300MP for Opel truck to improve income from points.
No more vet 5 system (which is broken like hell).
LMG34 upgrade - 120ammo.
Schreck upgrade - 100ammo.
King Tiger - with 100% income and ability to place Opel trucks, it would come far far to fast, similar T34

while units like IS2, Tiger or Pershing would come far far later than KT.
To solve this, 1: I'd place KT into new doctrine, 2: Make KT "doctrinal" with every single doctrine. In other words, KT would be unlocked any time (despite tiers) when any of your doctrines reach 14CP. So no matter if you go Jaeger or Fortifications, once you reach 14/15CPs you can build KT (no rushing for 16min KT)