As OurWorkbench mentioned, move the tension assembly "under" the bobbin for even winding/stacking. As for the spool pin- IMO it's too close to the tensioner so it doesn't unwind with even tension, and may even twist the thread. Also as mentioned you want to introduce a bit of drag on the spool to eliminate backlash. Think of it as casting with your fishing reel.
If equipped with the "notch" that OurWorkbench points out, use that. If not (and what I use) is a thread stand placed somewhere within line of sight of the tensioner. You want to insure the last "eye" before the tensioner is fixed, which the path directly off the spool is not (fixed.).