That TC is working well for you, Mike! I recall back in my rather early film days, 50+ years ago, when my equipment consisted of a Nikkormat FTn, a 50mm f1.4 lens and some off brand 135mm telephoto lens, that I purchased a TC, the name Soligor comes to mind, as well as a set of close up filters. Granted, you are using a brand name TC with a reputable name, but I assure you that, judging by your photos, we have come a long way.
Thanks, John. In the old film days with my Pentax Spotmatic, I had some TCs that reduced the f/stop so far it was like looking into the night. Got some surprisingly good shots when I had great sun and could hold the camera steady.