You need to replace those points when the cam follower gets worn out.
It throws off the mechanical geometry of the points opening.
Then the points are opening when the stator winding is not at maximum flux voltage.
And having an old weak condenser makes it even worse.
You should Gap your spark plug at 0.022" to 0.019"
The smaller plug gap will give the ark more time to burn due to firing at a lower KV voltage.