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Engine temps

I have seen a few posts regarding engine temps.  I have a pair of 3196 CAT's in a 540 Searay Sundancer. I keep the boat in the Bahamas most of the time where the water temps a higher than avarage. In the last two years I have had my temp alarm go off on my starboard engine when I run the engines at 1850 rpms.  Once I lower the rpms down to 1800 the alarm shuts off within 30 seconds or so.  I have cleaned the innercoolers with a barnicle buster solution, replaced the impellers and the sea strainers are clean. Any thoughts?