Use better plugs... Base plugs from AC Autolite etc often does not have nickle etc coating as rust protection.
Front side V6 and L4 rust is a major pain rain etc gets to then thru the vents and lid edge. Worse when Recall work removes lid edge rubber.
HEI work w/ most Platinum plugs and only a little more $. Beside lasting longer have anti rust coating on metal.
Cone plugs should not be very tight.
Cone is a sealing area and a "lock washer" sim to cone lug nuts.
Many torque way to tight and causes big problems. Anti seize is lube to tighten and makes that worse for most users.
------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave