Interesting.

a buddy of mines 68 Coronet was converted above method and his blows ice cold and has for over 5 years now. He just cant remember the exact amount he put in it.

I charged mine this afternoon putting 36 ounces in it.
Its cold, Not as cold as the above 68 Coronet. BUT,,,,, based on my above 80 percent rule. It could use a tad more

I just dont want to go to far and risk damaging reed valves in the compressor