Great observation, and your intuition is pointing you in the right direction. I'll quote from the (very long) writeup:
The worst match-ups, given the setup speed of the entire rig, are against rush decks. It is not uncommon to use a Self-modifying Code for a Cerberus "Lady" H1, and draw for one of the decoders. Together, these provide most of the necessary access and disruption to slow down the rush. Against astrobiotics, we have the money to trash the sansans, and we need to. If they score the early astro, winning will be hard, but is possible. R&D Interface and The Maker's Eye win it for us. We don't focus on getting Security Nexus out against these decks. The rig is often just conventional breakers.
Similarly, rush is tough. You have to be OK losing the first 3 points and focusing a little more on rig. The up-side is that while constantly forcing rezzes, these decks often don't have enough money. Just make sure that you can switch to remote sniping on a dime if they drop an Oaktown.
SYNC and Spark aren't that bad to play against due to Magnum Opus and high link.
Haarp is often a loss. 24/7 is annoying. I don't like Plascrete Carapaces. If you don't want to lose against these decks, then include 2.
First, you never really get Nexus out against FA, so the setup is really just basic Kit. Lady is often tutored for first. Significant R&D pressure usually finishes. The inclusion of 3 cheap decoders makes the matchup possible to win. Inti might be a good inclusion if push comes to shove, but I've found lady to do well (mainly to deactivate the wraparounds).
I hate how often I've paid through 7 strength wraparounds with cybercyphers. It does often yield a beale or breaking news, though.
Popups suck early, but open up sustained R&D lock late game after escher.
So I would contend that it is absolutely not unwinnable. It is tough, though. The key observation is that you're likely not getting your Nexus out. Honestly, I've had much more trouble against Wayland rush with mass barriers. If you don't get steal the first Oaktown, it gets real hard, real quick.