40 Mercury Smoking

[Marshgoat]

I have a 1999 40 Mercury 2 stroke 3 cylinder that starts and runs great. This past weekend I had a family emergency and had to run wide open (5500rpms)to the landing for 15mins. The guy running behind me said my motor was smoking quite a bit while running. I pulled the plugs and they are a little wet but the electrodes are nice and tan. I have the service manual for the engine and have timed it, synched the carbs and oil injection pump and have good even compression on all 3 cylinders. No mods, bone stock on an 18x48 1/8in alum flat. Burning Mercury oil only. Motor runs great and doesn't give any problems. Never noticed the smoke before, and it cleared up while idling at the landing. Anyone have any thoughts or recommendations on what I can check ??????