Here are the results using the described modification:
Before: Quality 95.1%, VT 76 EB/No 5.55dB (based on improvements described in the August 12, 2018 Post - the out-of-the-box figure without any modification was around Quality 69.7 VT 455)
After Mod: Quality 98.4%, VT 26, Eb/No 6.83dB
Before: Quality 77 on a good day (based on improvements described in the August 12, 2018 Post. The out-of-the-box without any modification figure would be significantly lower. Did not get images of the before shot, but the location is mid-U.S. so GOES 17 is a challenge with a 1m parabolic reflector antenna. Results were similar to those achieved with GOES 15 shown in the May 26, 2018 post.
After Mod and after accounting for skew and optimizing position: Quality 97.5%, VT 44, EB/No 6.26 dB
GOES 17 skew optimization was done by modifying the bracket to allow fine tuning of the skew. The skew was optimized using this link https://www.dishpointer.com/
and then fine tuning the adjustment by hand while watching the USA-Satcom Dish Alignment feature of the XRIT Demodulator.