Regardless of what you are "showing" to be great 4G coverage, this is not the case. Perhaps a dose of reality is due for a realistic analysis of your coverage map....Cupertino is notoriously bad for service and I would bet any of your customers in this area would say the same. I too have heard the same story regarding tower coverage in Cupertino.
I will report, however that for at least my home, it has improved slightly over the last month or so. I typically see 1 bar at 3G and sometimes 4G intermittently. Sending text messages, especially photos is still delayed and forget using the browser should the Wifi be unavailable.
I used to brag about how awesome my Verizon signal was. It seems network wide, this is not the case anymore. It is unfortunate. I have been a satisfied Verizon account holder for about 12 years until now.