I have been dealing with guiding issues for the past few months. I can't seem to get my total RMS error to 1" or less. At first I was thinking it was the weight, I have a CGEM DX Mount with 1100 Edge HD, and had a ST80 on it along with all my camera equipment I was pushing 44 lbs, the mount can only do 50 so I was getting really close to the max payload limit. I use this was a hyperstar setup so for most of my imaging I need a guide scope. And I'm using either the Orion Starshoot Autoguider Camera or the asi120mc-s with the same results.
Given the hyperstar reduces my focal length to 560mm I can get away with a smaller guide scope. So I removed the ST80 and my dovetail bar, replaced with a 50mm guidescope which reduces the weight by a good 7 lbs. But I'm still getting the same guiding problems, it helped a little I would say but nothing significant. I've looked to see if the motors needed tightening and made some adjusments but again no big improvements. Also ran the guide helper in PHD2 and applied the suggestions but again no major improvements.
As far as polar alignment I think I'm pretty good there, I've got a polemaster and I spend quite a bit of time trying to get polar alignment as perfect as possible. My RMS Error is somewhere betwewn 1.5' and 2" but I can't really take exposures longer than 2 minutes without seeing the stars elongated. I would like to be able to take 4 minute exposures (without the hyperstar) but to do that I really need to get the RMS error below 1". So I'm at my whits end, attaching my guide logs from the last session. Any help would be greatly appreciated.
Guide Log From 9/14: https://drive.google...WCcWVH-WqvgysJB