If 1 "cheaper 60 range tank" is enough to shut your all armor, you have some serious learning of play to do.
Alternatively, stop spamming panthers against units that aren't even in opponents doctrinal choice?
Panther isn't answer to all golden boy, other units are more suited for other situations, you know, like countering TDs.
If allies can deal with ele and JT, you are mentally capable of learning to deal with much more fragile, less threatening and lower range versions too.
I dont think my suggestion is to buff panther into a direct TD counter. But makes it a overall more suitable tank hunter, late game stock units.
Things have changed that allies have heavy armour supported by 60 very good scaling TD
Besides you cannot compare cheaper But just as effective TD with ele and jt. I don't think anyone has.
Sure the ele and jt are good in 4v4 but in my 2v2 they hardly that good these days.
I would swap ele with double jp4 call in...with boosted pen stats of course.