Thanks for the info. I first started with 0.5mm retraction and 20 mm/s retraction speed, but I think I had the minimal extrusion before retraction set to a small value of 0.02mm in all tests (default value I think?). I will do some more testing later with modifying this parameter.
I know Cura gives an explanation of "minimal extrusion before retraction," but I'm still a little confused by what it actually means? By changing this value to 0, won't it make the problem worse since the extruder won't be extruding or maybe I have that backwards?