Yes, I think you should continue to apply air pressure while turning the cylinder through the entire compression stroke. It should tell you something - either that you are not leaking all that much, or that the cylinder wall has some kind of gouge.
Not all that likely to have a gouge in the cylinder wall, but possible I suppose.
The cause of your miss might also be a clogged up prechamber, filled with carbon. Or the injector not injecting fuel in that cylinder.
At some point your testing might include swapping injectors to make sure it's not a bad injector on that cylinder - but I don't think you're there yet.
Have you adjusted the valves? This is very important. You don't seem to have any indications that valves are a problem - but a valve adjustment is a free confidence check.
I would think that with compression a little low on one cylinder, you would get uneven running and some smoke. Wouldn't the fuel partially ignite enough to smoke?
You want to exhaust all the possible "easy-to-solve" issues like fuel delivery before you start to tear into the engine.
Ken300D
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