So I came from Ubiquiti to TP Link and my internet speeds are horrible.   

Im curious.  If you place the TP Link into Access point mode does it help?   Almost operating in like a bridged mode.

Rght now I go from my Internet Router to the TP Link and then to a 5 port switch.   I have a 500 mbps pipe down and when I run a speed test Im getting at best 50 mbps down..  Im doing something wrong