[Knot On Call]

The keep pump on my 52 Sovran Salon comes on after running for approximately 1 hour even on calm days. I have to stop for a few minutes to let the keel pump work until it shuts off.  Then repeat an hour later. I checked for possible sources. My forward, mid, aft and davit bilges are all dry. I resealed my swim platform, no water is entering the shell and running down to the keel. No water is entering the engine room air intakes. All interior stringers under the intakes are dry. My only thought is can water be entering the small exterior cockpit drain holes on the underside of the swim platform side moldings. They are in the water stream while running. Has anyone experienced this issue? Thanks.