To the complaints about the limited traverse of the guns:
This won't prove much of an issue, given the fluid battle lines of our cartoon world (you will have to shift your possition to deal with the tanks that slipped around your side and are now threatening the town).
An effective and historicly used tactic would be to have a few set up on likely aproach routes, with tanks holding the enemy further ahead. The tanks then withdraw past the waiting tank destroyers, and the pursuing enemy walks (not charges. Most are far to passive when in tanks. Blitzkrieg tactics would be very effective in AH IMO) right into the ambush.
Personally, i would use them more as tanks than tank destroyers, as I usually "aim" with the tank, and "adjust" with the turret.
