Looked at your e-pic of spark plug and whole heartedly agree that changing "any" of the sparkies can be a PITA. Most folks measure the gap, or the space between the tip and electrode.

From reviewing your e-pic it looks like the tip has sufferred some erosion, resulting in more of a point than a rounded and or flat post that allows electrical current to jump from one side to the other. Just an observation and may be wrong. Pictures may be worth a thousand words, but unless you can put an eyeball on the situation and or problem..... ou just don't know. Like I said, just an observation based on your e-pic.

Good Luck. I wouldn't think that 2,000 miles of driving within a calender year would require sparkplug replacement, but I am just a junior member.

Mike