HAS ANYONE HAD THE PROBLEM OF SEVERE PULL TO ONE SIDE UNDER POWER, WHEN I LET GO OF THE WHEEL THE BOAT PULLS HARD TO THE RIGHT OR STARBOARD. MY BOAT IS A 1985 ISLANDER 34, DEEP FIN KEEL, FAR AFT RUDDER, MIDSHIP MOUNTED ENGINE WITH PROP ABOUT IN THE MIDDLE BETWEEN THE KEEL AND RUDDER ANGLED DOWN AT 12 DEGREES, ENGINE YANMAR 3GMF20, WITH A FIXED 3 BLADE PROP 16 X 9. ANY SUGGESTIONS WOULD BE APPRECIATED!!!