I changed my OE plugs out at 40k miles. My 2012 F150 Ecoboost was experiencing a cold irratic idle and stumbling while accelerating. The new SP534's solved the problem. My OE plugs were gapped anywhere from .030 to .042.
I have not drilled the CAC like you're mentioning. I have had, on 3 separate occasions, experienced the weird shudder when accelerating. The last time it did it, the truck ingested so much water that it went into "Limp" and only ran on 5 cylinders. Dealer did the most recent TSB, put some bullshit plastic piece on the CAC that covered about half the surface and put in a new cylinder 6 plug and coil.
Since then, it hasn't happened again. Seems to be fixed, however the most recent TSB that is suppose to address this issue, de-tunes the truck some for sure.
I change the oil every 7,500 miles with Ford SynBlend and Motocraft filter. Swapped out the OE air filter for the AEM one from Full-Race.
12 F150 FX4, EB, 2'' level, Toyo, SCT, AFE / 05 LJ Rubicon, 4''Currie, MTRs, Built 44's, Savvy