Spark gap...

I asked this question once before but never did get an answer, so here it is 

I've built a RQ style air blast gap, slightly modified so I could use parts I 
already had but it works the same way. My question is this: would the coil 
benefit more from me making the gap wider and using low psi (20-30) 
essentially to cool the gap, or would it be better to make a smaller gap with 
large psi (100-150) where the air itself is quenching the gap? Thanks.

Left, left I hadda good brain but it left...