Make Jadgpanzer to counter Scott. Problem solved.
Oh wait.. You don't want Jadgpanzet.. You want to wait for King Tiger or Panther, right?
That's OKW problem.
Try to use different meta than volks->obers->panther/kt instrad of making from scott OP unit.
A Jagdpanzer to counter a Scott? Seriously, do you really think any semi-competent player is gonna give you LOS on his Scott? The beauty of the Scott, being an artillery vehicle, is that you can park it behind shotblockers...and its not like you can make an offensive move with a JP.
That said, I don't think the Scott is gamebreaking. Yes it gets the occasional annoying squadwipe, but not to the extent that it would be out of all proportion. I reckon in 9 out of 10 situations the Sherman represents a better investment.