Midnight's most recent board activity was 06-13-2018. Hopefully you'll get some help. My only thoughts are to clean the nipple really well, use a new heater hose, and apply a thin coat of silicone grease before assembly. Maybe a different type hose clamp would help. My K20 has worm gear clamps there, but I prefer wire-type clamps because they never loosen... they always maintain pressure on the hose connection.
