Have a 95 Grady White 208, been fighting misc leaks since purchased last summer. Replaced all plastic thru-hulls with stainless, fixed other misc leaks around hose ends bait pump, etc but still have several gallons of water that drains after each time out. I tried pulling all deck covers while underway and checking with flashlight and by feel. Also have watched stern bildge area and never seem to have any water back there while underway. Where's the leak?