That poweline networking works at all is almost a small miracle on its own since power wiring was never designed with any sort of high speed signal integrity in mind. Practically everything that goes into keeping the power signal clean is counter-productive to high speed signaling too.
If by "half my Ethernet speeds" you actually meant half your internet speed, then I doubt that upgrading to 2Gbps powerline equipment when 1Gbps equipment could barely provide 45Mbps usable will help you much. Powerline is a lot like WiFi: the claimed speeds are based on the most optimistic situation possible (ex.: both powerline-networked machine being merely feet apart on the same branch circuit with no noisy appliances on that circuit) and the second you stray away from the best-case scenario, you get rapidly diminishing returns from going top-end.
You may want to try an USB WiFi adapter instead. Using an extension cable, you can orient the dongle in whichever way gets you the best signal with your router, perhaps even experiment with placing the adapter in front of a reflector to boost signal.