Don't know if you solved your issues but I figured I just comment in case you didn't..
Get yourself some diplexers and install them at your MoCA locations, in your case you have have three MoCA devices so get three diplexers.. Pass the TV signals to your sets and pass the SAT signal to your MoCA device.. This would eliminate the need to pass the entire MoCA signal through them where the signal is useless..
Secondly, I would try using regular splitters that are rated up to the 1Ghz band instead of the 2.5Ghz splitters your using now.. The higher frequencies result in higher loss through your cable run.. Run your MoCA devices on channel 1 to utilize the 1Ghz frequency which is stronger..
The length of a film should be directly related to the endurance of the human bladder. ~Alfred Hitchcock