Do you have monofilament in the bobbin as well as the top? I never use it in the bobbin. It tends to stretch too much when winding it on to the bobbin. I use a fine 60 Wt thread (magnaglide in the LA and So Fine in the domestic). I usually use either Superior Monopoly (a polyester monofilament) or Filtec Essence (the same people who make Glide and it is a traditional nylon Mono). I run the top tension pretty loose when using mono in both my domestic and my LA and I go slow no matter which machine. I tend to only use it when doing ditch work (both SITD or ditching around applique). If it continues to cause you frustration you might want to consider a 100 wt thread. When I don't want the thread to show and only want the texture I opt instead for a 100 wt thread in a neutral color like Wonderfil Invisifil or silk. I have not tried Superior Microquilter but would assume it behaves much like invisifil as they are both 100wt poly. Surprisingly, a sage green seems to play nice with everything.