What is important is that the plasmoid is round more or less and the amount of current that run through it. I dont think its matter so much if the plasmoid is divided in filaments or look as an coil or toroid etc. Its round and the current goes round and round as the current in a electric coil. As in an electric coil you can press a big current through a thick electric wire but laps will be few or you can press a smaller current through a thin wire but the laps will be many, but the magnetic field is roughly the same in both cases. The more current the stronger magnetic field which contract the plasmoid which also leads to a stronger field. The Amp must be very important cause it decide how dense the plasmoid will be.