So far I'm not too impressed with the clapton coil, but at least I know the super easy trick to rebuilding the stock heads. I have plenty of 1.3 single wire
coils to drop in. I am discovering that I like the better airflow of the stock heads, the air holes in the bottom stem of the
rba are too small, but not enough metal there to drill them out bigger. If you're curious as to what I'm talking about, check the hole sizes in the stem that screws into the base on the KSM heads vs the
rba vs the Crown stock heads and rba. It's not the air flow controller restricting the KSM rba, it's the tiny bottom stem holes.