I am trying to adjust the plotter here, and I am not having very good luck. I have been usuing it a long time, and I usually can dial it in without issue. I put in a new blade, and lubed everything up properly. The cut strip looks good. My circular shapes are having that little nub, and I can't het it to go away. It is also not completeing letters well enough to weed on the side of the vinyl closest to the controls. Suggestions?