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Yeah, this doesn’t surprise me. A common complaint, these engines have overboard drains that route excess fuel/oil mix down and out of the exhaust housing. Like others have said, it is extremely important that the engine gets up to temp, the thermostat must be working properly. Needless to say, this problem will be worse on engines that are idled extensively/trolled. Always a good idea to run thee engine hard at WOT for a few moments at the engine of the outing in an effort to clean everything up. From what you have written, the engine seems to be running well, so it seems unlikely that there is a water leak coming through the exhaust cover. You might try a different brand of oil/fuel.
It is also a possibliity that you have a gearcase leak. Perhaps the milky mess is gear lube mixing with water. I would drain and inspect the gear lube to rule out this possibility…