If anything, 2400 seems a bit on the low side for a cruise RPM -- diesels like to be pushed hard.
We run a fixed, three blade prop too. On our 3GM30F, our typical cruise RPM is 2700-2800. We will bump up to 3K with a strong headwind or countercurrent. I don't know the max RPM for your engine, but it's probably in the 3400-3500 range like ours. Running at 80% or so should put you in the same band, i.e. 27-28K rpm.
Give it a try. If you're having trouble reaching those RPMs, your prop may be over-pitched.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT