Just one additional point.
Following the suggestion on one of the posts here, I have tried guiding rate at 0.3x, which seems to work better in my case. So thats where it is now.
I have 2 AM5 mounts. Settings are similar to the one in OP and guide rate at 0.3x. The first one (488s) generally guides at 0.5-0.65 total, and the newer one (288s) at 0.45 to 0.55. Of course, as Kevin said, those are very individual numbers specific to the mounts.