Plugs are Part of an Overal Design...
Plugs are part of an overal design, that is fully tested by Ford before they make a selecton. If an improvement in technology comes along like the double platinum, and the ignition system is designed to work best with these plugs, then, "if it aint broke, don't fix it" comes to mind.
If you're getting detonation, pull the SPOUT connector and see if that helps. It will retard the advance by 4 deg. at full advance (I believe).
Unless going all out racing all the time, the stock system is fine, if everything else is stock and working properly. If you've done some serious mods to the air intake, fuel injectors, cam, exhaust, you've renderend the EEC's stock programing settings useless. The system must continually "adjust" to best settings, where the "best settings" are in most cases not within its stock range of settings, even with adaptive logic.
discipled1