@toolcubed, if you called tech support to disable the Whole Home PVR function, that should get rid of any requirement for a MoCA POE filter. The MoCA transmitter / receiver on the pvr should be disabled at that point. I'd call tech support just to confirm that. Fwiw, we've never had a MoCA POE filter installed, which makes some sense as we don't use any MoCA functions in the modem or set top box.
As for the Return Path Attenuator, the problem here is the splitter, which drops the forward path by 7 db and adds a potential 7db gain to the output of the modem. Ideally one would have a splitter that drops only the forward path and leaves the return path untouched. I don't believe that such a splitter exists, so, it is what it is. From what I remember, you're signal levels are ok with the splitter installed, and it's probable that the techs aren't finished adjusting the output levels of the node, so it might be too early to come to any conclusions on what needs to be done. I'd wait until the dust settles and then see where the final signal levels are.