What other people already said: Currently, the Foxtrot is a bit weak, needing two to ground one Scout in one go etc.
I guess that's what happened in my current V19/3 game. No Alenium or Plasma Rifles showed up for almost two months, so there I was, fighting against three Fighters and Scouts/Corvettes with Fighter escorts. And assaulting an alien base full of Androns with ballistics is no fun, either. In the end, I killed most enemies with C4.
Based on said game, I think that Fighter squadrons show up a little too early which leads to even bigger problems once escalation points start to accumulate. But this could be bad luck with UFO recoveries, as said above, and the fact that I'm pretty bad at the mini-game.