Bingo! Media Prioritization was the culprit for throttled speeds on my EA4500. Followed SuspededFate's recommendation to check/disable Media Prioritization. Direct connect to my Motorola SB6141 (Docsys 3.0 8 channel down, 4 channel up) modem connected to Cox Cable in AZ was yeilding 64mbpsx12mbps. Not bad on a 25x5 plan. Thanks Cox for the extra BW.
Also checked WiFi and I am seeing the same 64x12mbps speeds.
Thanks SuspendedFate. Great tip!!!
Config is:
Motorola SB6141 Cablemodem (Docsis 3.0 8x4 channel bonding support)
Cox 25x5mbps plan - Phoenix
EA4500 v2 w/ CiscoSmartWiFi.com "cloud" connection enabled
MTU set to Auto
2.4 and 5 GHz set to Auto Channel Width and Auto Channel
MEDIA PRIORITIZATION DISABLED!