I will say that I don’t believe the 4 spiral test is a particularly valid test, and it definitely should not be used on a printer that hasn’t been dialed in. Think of it this way, we know that FDM printing is not particularly good at printing that type of pointed peak, and it is extremely unlikely that anyone is going to use it for that purpose. So, is it a valid test?
The other model looks melted, like the nozzle temp is 215°C or higher. It also looks like the layer height is very large. Was this printed using the Fast profile in Luban? Tests should always be performed at Normal, or slower settings. When I zoom in, the layer height of the print on the right is more than twice that of the print on the left.
For the 2 prints with stringing, what did you use to slice them? Is it Luban, as you describe in your first post? If so, that may be the issue. Try using either Ultimaker Cura, or PrusaSlicer. Ultimaker Cura version 4.9.0 and later, now have a Snapmaker profile that is built-in, which was created by a community member. PrusaSlicer seems to work slightly better for me, but you will need to create a profile yourself from scratch. PrusaSlicer only accepts profiles from the manufacturer, and Snapmaker hasn’t provided one as of yet.
While Luban does use a very old version of Ultimaker Cura, approximately 80%+ of the settings are hidden and can’t be changed. Also, my experiences with the Snapmaker filament were that prints would look great when printed at ~205°C, but the layer adhesion was terrible. At 215°C the layer adhesion would be close to what it should be, but the appearance would be bad, and stringing would begin at that temperature as well. However, the filament that you have may be rebranded from a different vendor.
Since the latest retraction test came out very well, I have a feeling that changing the slicer may address your issues. If it doesn’t, then we need to eliminate the filament as being a possible cause of the issues, by using a filament that is known to be good. A 1kg spool of a good filament will run you around $23 from Amazon. For these tests, you should only need a maximum of ~250g. There may be some 1kg spools available in the $16 range, but they could also be pretty bad, so it’s hit and miss with them. Also, I would recommend using a neutral color like gray for testing, as it is much easier to see the problems, and dramatically easier to photograph.
Because of the retraction results, I don’t believe that the filament is our current issue.