Removing the old paint “edges”

What are you sanding with? Need to use a block. Durablocks are awesome for this. Can fill some by building primer or use glaze. I'm no bodyman, but yes that would look awful...
Those 'edges' should have been gone by 220 grit. Should see something like tis as you go through the2017-05-20-19-27-36-jpg.jpg layers.