A BL30 PLT ON A PARALLEL VFR APCH TO A CLOSELY SPACE RWY CHANGED HDG TOWARD THE OTHER RWY'S CTRLINE AVOIDING CONFLICTING TFC.

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ATC WAS CONTACTED 3 MI E OF ABC AT 2300 FT MSL WITH ATIS INBOUND. CLOSER IN I WAS ADVISED THAT THE MODE C WAS ERRATIC. BOTH THE L AND R RWYS WERE IN USE AT THE TIME. I WAS THEN CLRED FOR A L BASE ENTRY FOR RWY 7L AND CLRED #2 TO LAND. I WAS TOO HIGH SO ADVISED THE TWR THAT I WANTED A 360 DEG L TO LOSE EXCESS ALT AND SPD. THE LNDG CLRNC WAS CANCELED AND THE TURN WAS APPROVED. UPON COMPLETION I WAS AGAIN CLRED FOR A L BASE ENTRY FOR RWY 7L AND CLRED #2 TO LAND. ON BASE APCHING THE TURN TO FINAL WITH THE TFC IN SIGHT; I LOOKED R TO CLR MYSELF AND SAW WHAT APPEARED TO BE A CIRRUS OR LANCAIR ON FINAL AT MY 1-2 O'CLOCK POS; CONVERGING AND NOT MOVING RELATIVE TO MY WINDSHIELD. I TOOK EVASIVE ACTION AND TURNED TOWARD THE ACFT'S TAIL TO AVOID A POSSIBLE MIDAIR COLLISION. A L TURN TOWARD FINAL WOULD HAVE PLACED MY R WING IN MY LINE OF SIGHT OF CONVERGING TFC AND WOULD HAVE IMPAIRED MY ABILITY TO SEE AND AVOID. IT ALSO WOULD HAVE VIOLATED THREE OF THE RIGHT-OF-WAY RULES; (91.112(B);(D) AND (G); AND IN MY JUDGEMENT MIGHT INVOLVE A COLLISION. IN THE COURSE OF THIS MANEUVER I CROSSED THE EXTENDED RWY LINE OF RWY 7L. AS I NEARED THE EXTENDED RWY LINE OF RWY 7R; I COULD SEE THAT THE SUBJECT TFC WAS FOR THE R AND NOT THE L RWY. AT THIS POINT I TURNED BACK TO MY FINAL FOR RWY 7L AND EXECUTED THE TOUCH AND GO. BASED ON MY PERCEPTION OF THE SITUATION; I FEEL I DID THE ONLY SAFE THING I COULD HAVE. AS A RESULT; AT NO TIME WAS SAFE SEPARATION COMPROMISED. I ACTED EARLY IN THE SITUATION AT A POINT WHERE SEPARATION COULD BE MAINTAINED. I HAD ERRED IN MY AIR TO AIR DISTANCE PERCEPTION. RWY SEPARATION IS MINIMAL AT ZZZ.