School Me On Distributor Performance

Long time for an update, but my first test drive resulted in a slipping transmission.

I ended up using one of the Mr. Gasket springs. It doesn't seem to be too loose, it doesn't start increase timing to maybe 2000 rpm? I don't have an underhood tach, so I'm not exactly sure.

The biggest concern I have is that I'm only showing 15 degrees of mechanical advance. I have base timing set at 15 degrees, and it's topping out at 30. I should be getting a few more degrees. My only thoughts are that I put on the wrong timing tape. I'll have to check.