I like your suggestion #1. Perhaps a slight increment on the xp points given could be useful.
the abilities (doctrinal) would be coming to early for them though.
Strelky are really strong in masses, so a slight increase in xp gained for them wouldn't be that much of a disaster,
TH are not to be used blindly - they are a special purpose unit after all. I'd also add "hold fire" option to TH, no matter if they are hidden or not.
This suggestion sounds to me more like a buff to the Panzer Elite, rather than a nerf to the Soviet Union...Also, what would be the point of ordering the Tank Hunters to hold fire?
Oh, so they're like Fallschirmjäger?