Yes, this list was based on Technically Correct, (link) by @ZiNOS! I'm sorry, I drew a blank on the name, which is a shame because it's a really great name.
Dropping the HQI does hurt a bit, because there are times when I know there are agenda(s) in HQ, but I don't always hit them when I run on HQ. I'd like to find the influence to put the HQI back in, but it's hard to find the influence to cut.
The deck does have lots of money once the engine is running, so late game Snowball v Corroder doesn't make much of a difference, but early game hitting rush ICE like Wraparound, the extra 2c can be problematic. Corroder improves early pressure a bit, but you are likely correct (Technically Correct?) that Snowball over Corroder doesn't hurt as much as missing the HQI.
I had been thinking of cutting Clot for HQI, but Chakana is just so much weaker than Clot against FA. I'm not sure Chakana's added bonus against other corps is worth much.
So far, the main problem I've had with my version of the list is actually closing out games. I can usually score up to 5 or 6 points fairly quickly and get the rig built up, but then the Corp just holds agendas in HQ and hunkers down. The best scoring window, especially for FA corps, is to wait for me to run out of cards/money and Levy.
At any rate, back to the point, HQI would help a lot. The deck has strong enough econ, and packs an Escher to actually leverage the bonus on Snowball.