Powerline mini problem

I just set up my mini with a powerline adapter. I have a Roamio plus as my main tivo connected by Ethernet. I connected one adapter to my wifi router and the other to my mini. Setup worked fine. Here's what I bought



http://ift.tt/1tG9wb0



When I watch anything in HD playback stutters and is unwatchable. SD channels are fine.



Is there anything I can do? Or is MOCA my only choice?