Decided to build another tandem match circuit based directional Coupler. This time I used a 21:1 winding ratio instead of the last one at 8:1.
It seems to have reduced unwanted coupling at lower frequencies. But more important it decreased insertion loss from about 1.15dB to only 0.03dB at 2 MHz and 0.4dB around 50MHz.
I think I prefer this particular winding ratio for my design.
@dantheclamman Exatly, just without the time travel :)