Hi and welcome. You're getting 1500, so there's no real reason that you shouldn't get a full wind. First thing - are you running the wire off the end of the spool? Secondly, what's the RPM of your winder? It takes a little practice to get up to full speed and be able to feel the wire tension, so IMHO it's best to use a lower speed until you build up experience. Assuming you have nothing snagging your wire, is the bobbin running true and do you have adjustable stops to limit the sideways excursion?