Hello, not to be rude, but i have donne and checked all the above, and no problem with the nozel, no prob with the isolator, however dont khnow if this mather but the machine itself isent level, one leg is 5mm above the table thinking the rods is atatched to the sides, and if it isent eavenly assembeld sould that make the "nozel" go in a up and down motion and drag the plate and not the bed being uneven, sorry my bad english.
// Joakim