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I haven't owned a Sport 150 specifically, but I have owned 6 whalers in the past 30+ years, and my experience has been about the same on all of them with regard to self bailing. Sitting still, like at a mooring, when you pull the plug some water will come in, an inch or two, and more in the stern than the bow. The water will equalize at that level. If it rains and water gets in the boat, it always equalizes to that level. I always have kept my whalers on their trailers, but I have been at the lake and wanted to keep the boat in the water overnight, and I always pull the plug in case of rain.