I was not telling it is OP.
Just a purchase priority (damn, “order” seems to means two things while in french I use “commande” for order and “ordre” for picking in a given order).
So, if I have 15 IPCs for M2 units, I go Grenadier and Tiger, if I have more I buy also SS Panzer. Meaning, if I had more than 29 IPCs for Tanks, then I can consider purchasing regular Tank. Or, if I have only 28 IPCs, my last unit will be Tank instead of SS Panzer.
That would be the optimizing way of purchasing M2 Tank units.
Is this kind of priority you want when Germany’s player will look into buying Tank?
Do you expect a different behaviour? If the case, then you have to still tweak your Tank roster.