WiFi Speed Problem

[PhoneBill]

US996 unlocked using OEM site. Phone is rooted. I am running the stock Oct. 1 2016 US99610d Build number deODEXd firmware. I am using Verizon wireless and Verizon FiOS which I recently upgraded from 75/75 to gigabit. At 75/75 my wifi speeds on my V20 were consistently 85/90 D/U with 9 or 10 ms ping using the OOKLA speed test. With my gigabit FiOS I have seen V20 speeds as high as 435/305 but no more. My FiOS desktop PC speed test using the Verizon gigabit speed test consistently shows 949/934 for router and 924/952 for device (PC). My V20 with the OOKLA test however will usually show something like 5 ms ping and 85/110. If I delete the OOKLA app, go into recovery and wipe Dalvic/ART Cache and Cache, then reboot and download the OOKLA speed test and run it I get the Very high 400/300 speeds UNTIL I get out of the app, then rerun it and get the old 85/110 speeds. The WiFi connection on the phone always shows 866 Mbps link speed. All OOKLA tests are from the same OOKLA site. I can tell if the phone on WiFi is in fast mode or slow mode by download speeds in general. I am frustrated trying to figure out what is preventing consistent high WiFi speed (all quoted speeds are from a distance of about 3 feet from the router. Does anyone know what the problem is? Thanks.