In the current patch, and probably the coming one too, play PE. Use AT HT, tread break to immobilize, then use a marder and snipe the tank from long range. Alternatively, MHT barrage can indirectly kill the tank as well.
Do not rely on shrecks, PaKs, or FlaKs, or any form of AT with infantry crew any time soon. They will be useless for a while to come.