Make Storms more expensive in MP and scale their upgrades to match their high prices, give em ober K98s stock, you now have "proper" elite troops for Elite Troops.
I really dunno if Storms can get much more expensive without having to be like release Obers (gameplay silliness we're best avoiding) to be balanced. For example, assuming Obers are balanced at their 400 MP cost (which is probably too much right now, but that's another story for another time), then Storms would require a similar initial cost and then have to pay more for their infiltration, and infiltrating Falls cost 380 + 60 MP
without an upgrade which and most people still find to still be overpriced...
Fortunately, Storms currently have a 0.05 greater target size than Obers to counteract that a bit, but nonetheless, I think Storms would be best with their price range not being raised and other things be done to improve their performance in total. Ober Kar98Ks alone would already be pretty neat. Perhaps reduce the cost of their upgrades and allow it to upgrade while not in allied territory (their Panzerschreck could frankly use a significant buff - 30 more munitions for double the firepower on PGs or another man and saving 90 MP for VGs definitely beats 0.05 target size. I'd say to give them a special ambush bonus that would make their Panzerschreck's shots more accurate and reload faster). I'm quite for giving them a better decap rate which would obviously fit their role. Field First Aid is definitely the absolute worst on them out of all the Wehrmacht units and it would be fitting for it to be changed to passive self-healing out of combat.