We live in the same area. My ping to Chicago is 72ms and my connection to Las Vegas (the LA server moved to LV many months ago) is 86ms.
Keep in mind, LAT (latency) is actually Ping + RTT. So the values are about 10–12ms higher than your ping would be.
Taking this into account my latency to Overwatch is the same as my WoW connections — 62ms to Illidan/Chicago and 76ms to Hyjal/Las Vegas.
There may be a Level3 or Equinix quick hop between Miami and DC. I’m not sure.
Which ISP are you using? Can you run a PingPlotter to the game server you’re landing on (IP can be found in the netgraph: Ctrl + Shift + N)?
Edit:
Thank you. I will try though. We’re making progress on the PSN account disconnection bug.