Turns out the two servers you play on are located at the datacenter in LA. Blizzard currently has four datacenters:
Boston, Massachusetts
Dallas, Texas
Los Angeles, California
Seattle, Washington
Eonar, the Eastern server I play on, is actually located in Texas! I didn't realize the location didn't mean server time (e.g. The Eldre'Thalas server is located in LA but is set to Eastern time). I figured that Eonar was close and that my latency was the norm, but in fact I'm probably getting 100-150ms more than I should be getting.
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