Managed to get higher in PoC as well, up to L40 with that weird crystal tentacle shrine thing. That one I still cant get through without very good rng (that damn thingy is tanky as fuck and dishes out a lot of aoe damage. Managed to wipe out all his tanks and got 3 of mine hammering it for almost 90% of its health before they got killed by that thing itself).
Leveling up both the tanks and the emblems over the last months did show some results, so its not all that bad.
The exp gain nerf from portal is annoying... kinda loosing the incentive to keep the game going. Its almost the end of September and there has been no content patch whatsoever other than few new tanks.