I've dug deeper into MoCa adapters, and do you think it could be that I don't (think) I have a MoCa POE Filter? I saw a few other people actually have connection issues to other devices because of not having the filter.

MoCA will work fine. Just make you get this and block it from leaving your house. http://www.amazon.com/Filter-MoCA-Cable-Coaxial-Networking/dp/B00DC8IEE6