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Look, don't over complicate things.
You changed plugs and have had an issue since. When you change plugs, you remove coils. Coils were (are) original and were at least disturbed when you performed the work.
If you have the right plugs, torqued to correct value, the most likely issue is coil or coil connection. Check connections to coils and drive the car. Check for misfires and codes. Clear codes if needed and drive again. If you still have misfires, Buy 1 or 2 coils and put them in offending positions if you don't want to spring for 6 right now. Clear codes, drive, repeat. You'll get it!
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