CMBN: Panthers available (enemy has Sherman 76's and Fireflies) -- Tigers and King Tigers only when Heavy Panzer counter is played
Why rule out the heavy German tanks? The bocage usually means they don't really dominate. And the Fireflies make short work of them, no? At least the Tigers.. not sure about the Tiger IIs.
Also, if you make them depend on playing a panzer counter, won't the Allied player then just stock up on heavy AT before every such battle?