Here's the updated test results:

TEST
M1: 15mph
RPM MEAS= 1440
%CO2 MEAS=14.4
%O2 MEAS = 0.5
HC(PPM) MAX = 118
HC(PPM) GP = 293
HC(PPM) MEAS = 212
CO(%) MAX = 0.75
CO(%) GP = 2.25
CO(%) MEAS = 0.46
NO(PPM) MAX = 799
NO(PPM) GP = 2002
NO(PPM) MEAS = 2283

TEST:
M2: 25mph
RPM MEAS= 1880
%CO2 MEAS=15.0
%02 MEAS = 0.1
HC(PPM) MAX = 93
HC(PPM) GP = 243
HC(PPM) MEAS = 128
CO(%) MAX = 0.63
CO(%) GP = 2.13
CO(%) MEAS = 0.26
NO(PPM) MAX = 738
NO(PPM) GP = 1802
NO(PPM) MEAS = 911

The car is in good running condition. It's an automatic. I'm not sure if its running NON-RESISTOR plugs, like Bosch Super H9DC? I have to check. The new catalyst is a generic one that muffler shop welded on. I'm not a mechanic so some of your terms are new to me like, "checking duty cycle and scoping the 02 sensor wave form and ignition wave forms". I'm going to read your recommended thread and try to understand. Worst case I can bring the thread to my mechanic.