I haven't really had a problem but I have a pretty serious noncommercial machine...a babylock ellegante2..they are dense but they always stitch out nicely for me. I use tear away stabilizer that I buy from Joanns, a pretty light bobbin thread, but don't really do anything special. I use schmetz embroidery needles usually a 75. They are quite stiff, but I honestly never thought too much about it because they look so nice and other designs I've tried end up leaving gaps so you see the material through the design.