MoCA Transmits Low

Also, if I connect to my Xfinity router I see that MoCA is not enabled. Does that have to do with the fact that it's in bridge mode?

Do I need to address this if I'm not seeing any issues with my settop boxes? What problems would I experience from a low MoCA transmit rate?

MOCA needs some specific hardware in a couple of locations to work optimally.

Some splitters are better rated for MOCA. Do a search on Amazon to find them. Here is one example - Amazon.com: GE Digital 2-Way Coaxial Cable Splitter, 2.5 GHz 5-2500 MHz, RG6 Compatible, Works with ...
https://www.amazon.com/gp/product/B0054EILOE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Reading the comments also helps as they describe the issues with MOCA and how fixed.

Also consider a POE/MOCA filter at ingress to the house:

Amazon.com: Filter, MoCA POE Filter for Cable TV Coaxial Networking ONLY: Electronics
https://www.amazon.com/gp/product/B00DC8IEE6/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

Even though I am purchasing these myself, I may call on Xfinity to send a tech and assist with the connections, especially the external one, to insure that all the specs are met for MOCA.

Finally, there are some good videos on Youtube that go over MOCA setup and troubleshooting.
Here is one that I saved:
Crosstalk Solutions - MoCA made easy
https://www.youtube.com/watch?v=dm_Znyh7uZ0

I will try to find some others that helped me along the way and share them later.

Good to know. Thanks!

FWIW, that splitter is more so engineered for satellite systems, not cable systems. It can actually make performance worse by allowing line noise ingress at those higher frequencies that cable systems do not operate on. Gold colored junk.

Here is a proper and a high-quality splitter for MoCA.

http://www.amazon.com/Holland-Electronics-GHS-2Pro-M-Splitter-5-1675Mhz/dp/B00P6VHLP0?tag=ds0233-20 /www.amazon.com/Ohm-Terminator-4-Pack-Cable-Connections/dp/B0016A986K

No prob !