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I have done something similar couple years ago. With Celestron achromat 100mm F5 I took series of images of distant house roof top with 1.25” 2X Barlow, no Barlow, Focal reducer and combination of Focal reducer and Barlow. The sharpest images were with combination of Focal reducer and Barlow. The worst images were with Barlow only. The magnification was bit less with combination then with Barlow alone and focus distance is also less.
I was bit perplexed why by adding extra number of glass surfaces Image quality improve. I’m glad that you have to same results and I was not seeing things.
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