If I were to redesign the vet abilities, I'd replace Blitzkrieg with "Spotting", disables the roof MG (if there is one) and gives the vehicle +10 view and +5 range (excluding Panther, it may keep Blitz, but at 15% speed bonus).
Capture Points would be replaced with "Flank Speed" on the T-34's, not sure what the KV / IS / ISU series would get to replace it though.
T-70 would keep Capture Points because I feel like it's one of the few vehicles it's truly useful on, plus capping while spotting is so ace.
That's a good idea, German optics were famously superior, I'd even go further and suggest some kind of aimed shot ability (in conjunction with the things suggested above) which increases accuracy vs tanks a great deal, as the Germans had excellent gunsights for sighting on long range targets.
German doctrine would be that having sighted an enemy tank, the gunner and commander would confer on the range together, allowing them a way better shot.