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Regarding loading (given air/fuel ratios remain constant), as rpm's decrease turbulence within the combustion chambers decrease, flame front speed decreases, and required timing lead increases. The end result - more negative work applied to the reciprocating assembly, more wasted work than driving higher rpm. This is a general rule with 1000's of variables, but there is a window where your loading/rpm relationship yields the lowest bsfc. Finding that window is the hard part.
It's doubtful you've done any measurable damage to your engine unless you've been driving it like that when it's cold for a while.
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