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and just bc your experience w/ copper was odd, does NOT make it the norm, myself (along w/ many others) have proven that coppers are the best in these engines (im pretty sure iv had more experience w/ the 4.7 than you have)
I always ran coppers in my 5.2 and 5.9. Hence why I threw them in the 4.7. Nothing but a little Internet search to show the data just doesn't match up after I started having issues with a .75 gap on my plugs...along with countless others lol
Do as you wish. And have fun with the coppers in your 4.7