I used Systune quite a lot when it first came out.
But, like you, I could not get the phase trace to display anything useful. I was using Smaart 5 as my standard for system alignment before that, and the phase trace was fine.
When Smaart 7 came out with live multiple traces-I stopped using Systune.
It may have different now, but since I have changed computers, I cannot seem to be able to get my license back. That seems to be problem with AFMG. But that is a different story.
The reason I chose Systune over Smaart was that i visited a Danley stand at a tradeshow. In the same stand was also Linea Research. The LR guy showed me how you can control their DSP within Systune from an iPad. Did get excited over that you could invert the measurement curve and overlay phase linear EQ correction. I later bought that DSP and obviously now wanted Systune.
Just a story for you that people actually but stuff after seeing them at trade shows, but also to consider the systune integration with your DNA SC48. Can complement each other beautiful if it can be made to work.