C7000 slow speeds

Good news - the "problem" is now resolved. The tech came out this morning, and I explained the whole story (just fyi, he worked for another company that Spectum sub-contracts work to). First thing he does is call Spectrum support, the first thing the Spectrum guy says is "we don't troubleshoot customer owned hardware". I tell him it's not my gear he's looking at, another Spectrum tech noticed line errors, which is why the dispatched a service tech in the first place. Spectrum tech says hold on..and a minute later tells us to do a test....and what do you know, instantly getting well over 100 Mbps.

Bottom line - the C7000 is a great device, and capable of 400 Mbps down (I got that from a NetGear tech on a phone call). As I had suspected all along, Spectrum had some configuration setting wrong on thier end. If you see similar issues, I highly reccomend you keep pushing with Spectrum to resolve - ask to have your case escalated to a higher-tiered support group and make them actually troubleshoot the issue, not just reccomend swapping out to Spectrum provided gear.