Coolant in my oil help

Hi can anyone help i recently took my rocker cover off to do my injector seals and i found coolant sat on one of my arp headbolts. My car has been using a tiny bit of coolent every 2 weeks. I have no loss of power car drives fine nothing leading me to think its the head gasket witch i know is tge main cause. Ive been told it could be my sanwich plate for my oil cooler causeing coolant in my oil. Ive took the big bolt out on the bottom of the oil cooler and made sure its all sealed correctly but would you reccomend changeing the gasket where the cooler bolts to the block or any other suggetsions? Thanks