I've said it repeatedly now: Obers come way too late to do enough good to be efficient to their cost.
I think something about Obers timing should be changed. You can get them now, before the Flak Upgrade on Schwere, but the thing is that noone does this as Obers without MG 34 are not really that good ( they can't even deal with Penals reliably on any range when the penals are Vet 1, which is a joke imo considering penals cost 40 MP less, come earlier, cost 1 Pop Cap less and cost 13 MP less to reinforce ) , so there is no real point.
My proposal would be slightly buffing / fxing pre Flak Upgrade Obers. Make the Schwere setup 10 Fuel cheaper and the Flak upgrade 10 fuel more expensive and also change vanilla Obers a bit. I have some ideas regarding how this change to vanilla obers could look like, although I think that some of them would not work ( is it possible to increase the price of a unit after tech up ? ) . The one which could work and would probably not be broken would be to give them the ability " Fast fire " Which would would be free and would make their K98s shoot faster for like 15 seconds ( cooldown should be like 40 seconds ) . Maybe even make this ability replace the somewhat useless "Suppression fire"