Using your normal AT nade will slow medium vehicles and you can hit them with a good volley of the other Nades (remember to use full squads to throw).
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Stick together in groups of 2-3 and an unwary Panther can be easily killed by 2 squads doing this.
Panther can be reliably penetrated with AT grenade only with rear armor hit.
Without engine damage its backward moving speed faster (or at least as fast) as your oorahing cons.
Even with engine damaged it moving at almost the same speed as cons without oorah being active.
AT grenade volley needs a fair amount of time between mouse click and actual throwing.
In order to score a good rear armor hit with volley you need to move cons FAR behind Panther.
Any half-decent player can prevent that from happening just clicking "move backwards" in time.
Maybe we're playing different games?