Oberstumfuhrer Cumdolf Hotler actually had me there, haha.
Would most of the problem of this doctrine be solved if the 'hulldown' would have a 2-5 seconds break-down time?
Personally I'd even change it so the set-up time would make the vehicle immobile, and unable to shoot/aim. Then buff the set-up time from 10 seconds to 5 seconds. The break-down time should also make the vehicle immobile, and unable to shoot/aim and set that to 2-5 seconds. That way, if you flank an elephant you get 2-5 seconds 'free' to shoot it (ofcourse depending on the player, if he keeps an eye on his elephant or not).
It would probably render the ability irrelevant if you were punished for bad positioning, most people already use the other doctrine anyway