Hi Ike, I like the 15 to 1 mix the best. 32 to 1 or 50 to 1 is ok with iron rings but probaly not so great with the rubber O-ring in our little gas engines.
In response to your youtube inquiry,
Is your timing wheel with the magnet as close as possible to the pick-up without rubbing it?
and
By chance, has the magnet fallen out of the aluminum wheel?
Gil