That was what I was getting at - the only thing that I have that leaves these enemies even remotely balanced is my ultra-meta-50%-usage-broken-gun. And even then, that doesn't do anything in Veil Proxima. I'd love to use my Hek, or my Supra Vandal, etc... But as I said, they feel like foam darts.
I have little problem killing these enemies up through Saturn... using my Riven on my ultra-meta Catchmoon, at point-blank range... and as many buffs as I can cram into Arcanes and Warframe, with optimal damage types, etc. Everything else just feels like I'm hitting a Fomorian with foam darts.