Firefly seems ok after DBP nerf.
FF is way to accurate since it has the highest mid range of any other TD including JP and Elephant.
Su-85 pop need to go up.
JP need to have its role defined. If it is a counter to mediums it need to have less pop and cost even if that mean lower HP/armor.
If it a counter to super heavies it need more penetration.
I would also be tempted to swap TWP for cloak from Stug to JP, since OKW have enough cloaked units and Ostheer have enough TWP.