What's off is your spindle to pivot distance, which you already know is "a few inches outside spec".
So here's the deal. All the alignment we're doing is to get the record to drag the stylus across smoothly without too much error. That's why someone came up with the idea of your long arm in the first place. A longer arm means a longer radius means less angle change across the record. This is all based on some guys idea. Its important not to get too caught up in some guys ideas. Except mine. You can do that with mine.
Okay so you got this very long arm and its mounted too close to the spindle. So what you do, take your arm and swing it out over the platter and look where the stylus falls. Look where it falls relative to the arm pivot point. Look where it falls relative to an imaginary line drawn from the spindle through the stylus. Look how cockeyed that line is with the arm. That's your problem right there.
Because the minute the record starts spinning its dragging on the stylus, and look at that angle. See? The spinning record is pulling the stylus towards the center. This happens on all spinning records by the way. Its just that normally the angle is almost square because the spindle to pivot distance is correct and so the arm doesn't go skating across the record like yours is doing.
You're trying to fix this with excess VTF which seems logical but in reality is only making the situation even worse. Because its this skating force that is pulling it in. The greater the VTF the greater the force. Not to mention you're putting excess force on the cantilever, putting it out of alignment, but that's getting a little deep for you for now.
Get a bigger piece of wood. Move that arm out where it belongs. Do not ever exceed recommended VTF. Skating problems are corrected with anti-skate adjustment, not VTF.
So here's the deal. All the alignment we're doing is to get the record to drag the stylus across smoothly without too much error. That's why someone came up with the idea of your long arm in the first place. A longer arm means a longer radius means less angle change across the record. This is all based on some guys idea. Its important not to get too caught up in some guys ideas. Except mine. You can do that with mine.
Okay so you got this very long arm and its mounted too close to the spindle. So what you do, take your arm and swing it out over the platter and look where the stylus falls. Look where it falls relative to the arm pivot point. Look where it falls relative to an imaginary line drawn from the spindle through the stylus. Look how cockeyed that line is with the arm. That's your problem right there.
Because the minute the record starts spinning its dragging on the stylus, and look at that angle. See? The spinning record is pulling the stylus towards the center. This happens on all spinning records by the way. Its just that normally the angle is almost square because the spindle to pivot distance is correct and so the arm doesn't go skating across the record like yours is doing.
You're trying to fix this with excess VTF which seems logical but in reality is only making the situation even worse. Because its this skating force that is pulling it in. The greater the VTF the greater the force. Not to mention you're putting excess force on the cantilever, putting it out of alignment, but that's getting a little deep for you for now.
Get a bigger piece of wood. Move that arm out where it belongs. Do not ever exceed recommended VTF. Skating problems are corrected with anti-skate adjustment, not VTF.