Depends on whether your force is drawn from a motorized rifle division or a tank division. If motorized rifle, probably more accurate to stick with the T-26's. If a tank division, especially considering you've had those tanks in operation for awhile, it wouldn't be uncommon for them to need heavy maintenance (at the factory), and T-34's were not uncommon in the tank divisions. At least according to what I'm seeing on
Niehorster's TOEs and
tank strengths.
One thing to consider is the AI's buying habits, the AI tends to buy the latest and greatest a lot. It isn't uncommon to see the AI buy units three or four months earlier than when they first saw battle (or were at least in common use) historically. Rather than seeing mainly 2cm and 3.7cm armed panzers as was
common, I wouldn't be at all surprised if you encounter lots of 5cm and 7.5cm armed panzers of the uparmored variety which might be tough to handle.
Maybe upgrade your ATGs if you keep the T-26's?
My 2c, hope it helps
Brian
PS: not knocking the excellent work on the OOBs, its just one of those "can't please everyone in every situation" things combined with game limitations.