It's not of great importance, but the Ideal 85-133 has a specified bandwidth of 5 to 1000 MHz which is more than needed for OTA signals which range from about 50 to 700 MHz. It sounds like your 2-way splitter is a satellite system design which will work just fine... but the extra band-width goes unused.
Your report continues to suggest that you could try removing the reflector screen from the CM4220 and expect better signal quality from WPXA.
Also, I'm still convinced that none of the UHF only antennas (such as the CM422X series) will do a good job receiving real channel 8. In addition to the Antennacraft Y5713 mentioned earlier, you may also want to consider the Antennas Direct
C2 VHF Reflector Assembly which includes a VHF dipole and UVSJ.