ACR MLG ON LOW VISIBILITY APCH TRIED TO SALVAGE LNDG AFTER GO AROUND INITIATED.

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AFTER 4 HRS FLT TIME ARRIVED AT SEA. WX HAD STARTED TO GO DOWN. ARPT USING ILS 34R APCH WITH A RVR OF 3000'. ATTEMPTED FIRST APCH AND INITIATED MISSED APCH AT DH WITH UNEVENTFUL GO AROUND. STARTED SECOND APCH; AT DH I SAW APCH LIGHTS. AT SAME TIME COPLT STARTED TO PUSH THROTTLE FORWARD FOR GO AROUND. I DID NOT REALIZE THAT THE TOGA BUTTONS HAD BEEN PUSHED. WHEN I GRABBED THE YOKE I DISCONNECTED THE AUTOPLT. AT 100' RWY CAME IN SIGHT AND WE WERE LINED UP A LITTLE RIGHT. AT THE SAME TIME I BECAME CONFUSED WITH THE THROTTLE RESPONSES BECAUSE I DID NOT REALIZE THE TOGA BUTTON HAD BEEN ACTIVATED. WE STARTED A LEFT DRIFT WHILE I TRIED TO TURN THE LIGHTS ON FOR BETTER DEFINITION OF THE RWY. AT ABOUT 50' THE DRIFT BECAME FASTER TO THE LEFT. WHEN EDGE LIGHTS CENTERED UP AND ALSO ILS TWR WAS SEEN; GO AROUND WAS INITIATED FOR AN UNEVENTFUL GO AROUND. ON GO AROUND IT WAS LEARNED THAT THE RVR HAD DROPPED TO 1000' ALL XMITTERS. LESSONS LEARNED: 1) A BETTER APCH BRIEF WITH COPLT KNOWING TO CALL DH OUT EXTRA LOUD SO IT IS DEFINITELY HEARD. 2) APCH SHOULD HAVE BEEN DISCONTINUED AS SOON AS THE AUTOTHROTTLES FELT FUNNY AND DEFINITELY WHEN THE RWY WAS NOT LINED UP. 3) ALSO BRIEF A POSITIVE GO AROUND CALLOUT AGAIN TO DISTRACT THE OUTSIDE CONCENTRATE. I THINK ANOTHER CONTRIBUTING FACTOR WAS THAT THE TIME WAS CLOSE TO 2 O'CLOCK BODY TIME AND CONCENTRATION WAS JUST A LITTLE SLOWER THAN NORMAL.