These are some of the measurements of the system. The first graph shows the measured response of the Mid and Tweeter combined, on-axis and about 7 degrees off-axis on the side where the tweeter is closer to the edge. There is a very small difference in level, but note how it is relatively smooth for both axes. I tend to listen with the drivers aimed to a point a slight bit behind me, so the low-angle off-axis response is important to me. I need to set up to measure the response with the woofer, but have not got that at this time.
The next graph shows the responses of the Mid and Tweeter measured individually and their combined response.
The CSD below is that of the of the combined response of the Mid and Tweeter on-axis.