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lancelot,
While I was one of the people arguing for lower rpm, the argument assumed proper gearing/pitch. Glazing will not be an issue for you but there will be other issues like lugging. I would recommend taking out some of the pitch when you get a chance so that your engine can turn over faster for a few reasons. As you mentioned, lugging is bad. Lugging is trying to get too much power out of each combustion cycle by simply forcing more fuel in. What this means is that rather than having the work done by the engine spread out over more combustion events, it is concentrated greatly increasing stress.
You most likely are not realizing the full power potential of the engine because of your gearing. This will be made even worse if you are trying to push into bad weather and you cannot get up into the engine's powerband.
Lugging will not improve fuel economy as many believe. You are trying to force more fuel into the engine than should be there and it runs rich. Diesel engines are fuel throttled not air throttled so improper gearing will result in excess fuel for each combustion event.
Does this make sense as to the difference between gearing and what you choose as a cruising rpm?
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