Perhaps you, Bob, are unaware that your charge cooling scenario is no longer in vogue. Originally, the hot spark plug tip was thought to be the cause of pre-ign/detonation. So designers angled the plug closer to the intake valve so that the cooler incoming charge cooled the plug tip. Fast forward several decades & with better tools & more knowledge, it was discovered that the cause of the detonation was actually the hot area near the exh valve causing self ign of the A/F mixture. So modern engines have the plug nearer the exh valve to ignite that hot area first & reduce the possibility of self ign.
Read the article by Allen W. Cline, Engine Basics: Detonation & Pre-Ign written around 2000, 11 pages. I believe he is a GM engineer.
 Never heard of non-projected plugs solving fouling. Fouling was the very reason PT plugs were invented! From the Bosch Auto Handbook, 9th Edition, 1500+ pages: 'The use of materials with a higher thermal conductivity for center electrodes makes it possible to increase the insulator nose......This extends the spark plug operating range...& reduces the chance of soot formation.
 Power adder. I thought was obvious in this hobby. Nitrous, super or turbo charger.
 The heat range in bold type is self explanatory & needs no further explanation.