RWY EXCURSION ON OFFSET LNDG ATTEMPT.

Narrative

DURING AN ILS APCH TO A LNDG; I LANDED LONG AND HOT AND STOPPED IN THE EXTENDED THRESHOLD BEYOND THE RWY END. I ALSO HAD MY R MAIN WHEEL RUN OFF THE THRESHOLD AND INTO THE GRAVEL AS I TURNED THE PLANE AROUND TO TAXI BACK TO A TXWY EXIT. THE FLT WAS IN IMC (FOG AND STRATUS) FROM 800 FT CEILING; 1/2 MI; TOPS AT 1900. I MADE 1 APCH AND DECLARED A MISSED EARLY AS I WAS OFF THE LOC (FULL DEFLECTION). I SET UP FOR A SECOND APCH. I STOPPED MY DSCNT AT 400 FT AGL (PERSONAL MINIMUM). THE GND WAS VISIBLE; AT THE INNER MARKER; THE ARPT RWY WAS VISIBLE TO MY L. I DECIDED TO ATTEMPT THE LNDG EVEN THOUGH I KNEW I WOULD LAND LONG BECAUSE OF MY OFF CTR ALIGNMENT AND EXTRA ALT. I LANDED BEYOND THE FIRST 1/2 OF THE RWY AND WAS 'HOT.' MY OPTIONS WERE 2 AT THIS POINT: 1) PUSH THE THROTTLE FORWARD AND DECLARE 'MISSED' OR 2) HIT THE BRAKES AND STOP. I DECIDED ON THE LATTER EVEN THOUGH I KNEW I WAS MINIMAL IN STOPPING DISTANCE; KNOWING MY PLANE'S PERFORMANCE I FELT I COULD SAFELY STOP. COMPLICATING THE STOP WAS THE ADDITIONAL FACT THAT I WAS RETURNING MY PLANE TO CHINO TO FIX SOME MINOR SQUAWKS FOLLOWING MY ANNUAL. I HAD HAD THE BRAKES REPLACED DURING THE ANNUAL AND THIS WAS THE SECOND LNDG SINCE. THE BRAKES DID NOT PERFORM AS I EXPECTED BECAUSE THEY WERE NOT YET 'BROKEN IN.' NEITHER MYSELF OR THE ACFT NOR THE ARPT SUSTAINED ANY DAMAGE. THE EVENT WAS INVESTIGATED BY THE ARPT SECURITY OFFICER. I REALIZE THAT I HAD EXERCISED VERY POOR JUDGEMENT IN THESE 'MINIMAL' IMC CONDITIONS. I SHOULD HAVE DECLARED A SECOND MISS -- ASKED FOR A HOLD FOR A WHILE TO WAIT FOR IMPROVING CONDITIONS. INCIDENTALLY; THE FORECAST WAS FOR 3 MI VISIBILITY AT TIME OF ARR. AS A RESULT OF THIS EXPERIENCE; I AM SCHEDULING SOME INSTRUCTION TIME TO SMOOTH OUT SOME 'APCH' WRINKLES. MY ILS APCHS HAD ALWAYS BEEN VERY ACCURATE; BUT I HAD NO HARD IMC EXPERIENCE FOR SEVERAL MONTHS -- A BIG DIFFERENCE. I HAVE ALSO INCREASED MY PERSONAL MINIMUMS UNTIL I AGAIN FEEL CONFIDENT. I WILL NEVER AGAIN ATTEMPT THE STRAIGHT-IN LNDG UNLESS VERY ACCURATELY ALIGNED.