How does a Bren Carrier beat a 221 though? You always have the advantage of forcing the engagement - you have a turret, they don't. Be creative. It's hardly a waste of a doctrine pick either - the Sturmtiger is great, you get artillery and accuracy from Panzer Commander and HEAT rounds are the cherry on top.
https://www.youtube.com/watch?v=am_gUl3wFVQ
Any non-overwatch doctrine vs UKF is a waste, only way you can win vs UKF is JLI and booby trap abuse.