Check the price difference between PzIV and M36 and Panther and Sherman.
Now check the range difference.
Finally if in your pinion Panther is causing problem lets mirror it's stat, timing , tech cost to M36 and see how it goes.
This game cannot be asymmetrical so no point of comparing all of this when the general theme/purpose of building a Panther or Jackson is to hard counter other tanks which both excel in (especially against mediums).
Jackson is one size fits all unit and its by choice of design of the US faction. You cannot nerf Jackson without nerfing the entire faction's AT capability for late game. Dont even say Riflemen with Zooks and AT guns are viable late game with Panzerwer, Stuka and Arty abilities are rampant.