One can start by simply returning Ostheer tech cost to what it was and work form there.
These faction where designed without back teching. If one want them to have back teching one will have to tone down their unit as it constantly begin done with pack howizter. Removing a "design" weakness without removing a "design" strength simply does not work.
Yet the early face game has become about light vehicles instead of infatry. Will all saw the WC2020 being about WC51 and 222 which is not healthy.
I do not think that this very accurate many unit had their cost tech cost and/or price and/or power level increased.
Or one could T70 equal to P2 and delay the P2 to similar time frame as T-70...
1- You just created a problem where there is none for the other 2 factions, while OKW remains the same as well.
2- Do you think 222, FHT, Puma, P2, Flak HT, AA HT, M20 and Stuart are too strong atm?
3- The early game has been change due to doctrinal infantry and abilities once heavies are no longer a victory condition. It's has not been conditioned by light vehicles and Dodge is just a consequence of how good the OH meta is atm.
Before the heavy meta we had things like Ostwind rush and all recently reworked commander units like Pathfinders, JLI, Falls, SVT drops.
4- Timing wise (tech rush) it pretty much similar for UKF/OKW/USF. OH/SU has been the ones left behind and it's one of the reasons why old OH depended so much in panic Puma. I disagree about power level of lights.
-T70 has been dropped down in power level, just not at the same rhythm the game has go down.
-M5/Su76 had been severly nerfed
-Stuart/AEC had both way higher AI on top of more disruptive abilities.
-Greyhound nerfed
-AAHT/Flak HT both nerfed although made far easier to use.
-P2 nerfed.
-222 overbuffed but like 6 years ago and then nerfed while receiving QOL changes.
5- P2 is not the only problem. What do you do with FHT/Flak HT? Do you make them obsolete by delaying them more even though USF/UKF can field Stuart/AAHT/AEC? Do you put the FHT upgrade back in BP2?
How much do you plan on delaying ALL light vehicles and HOW, because it's not something that can be done in stages or by faction. It has to be done all at the same time. And then how much do you delay medium vehicles so light vehicles can operate? And how much do you delay heavy vehicles after that ?