QuoteAside: A Lenovo card let you install an Intel NVM image? (Lenovo usually supplies their own via Intel OEM tools.)I followed https://gist.github.com/mietzen/736583d37a1d370273c0775aaaa57aa5 which allows you to flash any available firmware.
I also followed the Multi-Gigabit guide you linked.... but then I remembered I was testing from a gigabit host. When I tested from a 10G host, I was able to hit 1441/349 from the waveform buffer bloat test.
All of the other "normal" speed tests report around 400 down, and slowly climb to that number. Is the that indicative of another setting I need to modify? I don't think I've seen higher than 8% CPU usage.