Tonight I gave RST-135 and SM 1.6.0 one more try.
Worked well.
Yes, I did have some USB cables/connection issues and I did have the mount under-powered.
Fixed that.
One more thing which caused yet another problem - after the update to 1.6.0, the RST's option "simulate the pier side" got turned ON.
It should be OFF.
Once I got all this figured out, everything started working beautifully.
Tomorrow I am going to go to a remote dark location - hopefully, the setup will cooperate.
Thanks!

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