What I meant with point no. 2 is that this measurement here in yellow, i.e. with the DSP turned off:
View attachment 396685
looks different to this measurement in red (i.e. the "before" measurement which the Anthem is correcting). Notice the lack of the dip at 60Hz and lack of the bump between 10-15kHz, and the rest of the curves are subtly different:
View attachment 396686
What this means is that
you are not comparing the same thing. There are two reasons why this may be so:
1. You are comparing a single point measurement vs. a multi-point averaged measurement,
2. You are using different microphones (Anthem ARC-1 for initial measurement vs. UMIK-1 for verification) and possibly making other mistakes with measurement as well. For example, vertical vs. horizontal orientation, using the mini-tripod and not a proper microphone boom stand, failing to move furniture out of the way, etc.
This also explains why the Anthem may have made that dip at 60Hz look worse after correction - it is optimising correction over a larger seating area.
There a few diagnostics you should consider if you want to move forward.
1. The first thing to do is find out whether the Anthem microphone performs the same as your UMIK-1. Do not assume that two calibrated measurement microphones will give you the same result. Condenser mics are fragile, too many knocks on the head and they will go out of calibration. If Anthem decided to cheap out on their measurement microphone, it may not even measure properly. Using a proper microphone boom stand, take a sweep with the Anthem. Then carefully replace it with the UMIK-1 and repeat the sweep from the exact same position. Compare the two sweeps.
2. Using the Anthem mic alone, perform "before and after" (i.e. DSP on and off) sweeps of the system from the same five points that you used to take the initial measurements with the Anthem. In REW, add all the "before" curves together (Trace Arithmetic - A + B, you will have to repeat the process). Do the same for all the "after" curves. This will give you a better idea of what the Anthem is doing since you are now comparing like with like.