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That window is rather small, not sure how well you can see the piston, the piston can sustain damage and still be OK, it is the area around the circumference of the piston crown directly above the ring lands that you would be concerned with. Replacing a piston is not too much work after the head...

Unfortunately when you pull the head you may find significant damage to the piston after eating all those glow plugs, the real problem is if the damage is close to the outsides of the piston crown indicating that the ring lands have been collapsed seizing the top ring, it is somewhat like...

I corrected your grammar... Actually cracked cups are common, there is a "standard" for how long the crack can be and still re-assemble the head, although that one looks pretty bad, you may have found the issue. You can pull the head and have the cups replaced, there is an "updated" version I...

At this point you are not trying to determine if the engine is worn out or not, the exact compression number is not as important as the difference between cylinders, yes it will be lower cold than if hot and you do not have the prescribed test equipment so you are not sure how much the setup you...

When you scoped the pre-cup can you see that it is intact, can you see the little "window" going into the cylinder and it looks like the others?

I do understand and somewhat agree with your assessment of Chicom products, many of the parts used in US "manufactured" goods are made in China, Look at HD, just about everything on a Harley has been made in China or some other third world country since the mid 80s But they do have a hand in...

With the pressures you list you have a 17% variance, as a general rule 10% or so is ideal, I am sure there is a spec out there but I do not have it for the 6.2L. IMHO that is not an obvious red flag. I think generally the pressures should be a little higher but for the most part one is looking...

That is really odd, interested in the comp. test. Do not discount the advice given by others regarding the aftermarket (chicom) glow plugs, they have reputation of giving nothing but trouble in the HMMWV world and have for a long time. Although this may not be your present problem.

Considering how the IP operates it is highly unlikely it would deliver more fuel to just one injection line, this would also likely be detectable by a "miss" or knock. It is also unlikely the harness is delivering more current to one glow plug with multiple injectors and glow plugs, and...

I would not think low compression would be an issue, too much maybe.. I have never heard of an injector burning up a glow plug, I am not sure how that would even be possible. Does the engine run good with no unusual noises or knocks??