A PVT RATED PLT FLYING A C172 FROM LUK RPTS CONFUSION AND DIFFICULTY NAVING TO REMAIN CLR OF CLASS B AND CLASS D AIRSPACE.

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I HAVE 2 SITS TO RPT AND BOTH DIRECTLY RELATE TO CINCINNATI CLASS B AIRSPACE. ISSUE #1 DEVELOPED IMMEDIATELY AFTER DEPARTING CINCINNATI LUNKEN FIELD. I DEPARTED ON RWY 21R AND WAS INSTRUCTED BY LUNKEN TWR TO MAKE A DEPARTING R TURN AND PROCEED TO THE N. IN ORDER TO GIVE SEPARATION FROM TFC IN THE PATTERN; I WANTED TO CLB ABOVE THE TFC PATTERN ALT. UNFORTUNATELY THERE IS NOT MUCH SPACE TO DO THIS TO THE W OF THE FIELD. WHILE WATCHING FOR TFC; I INADVERTENTLY CLBED TO AN ALT OF 2400 FT MSL BEFORE TAKING CORRECTIVE ACTION TO DSND TO 2100 FT. WHILE I AM QUITE SURE; ALTHOUGH NOT 100% SURE; THAT I DID NOT ENTER CLASS B AIRSPACE BY FLYING TOO FAR TO THE W; THIS EVENT SHOWED ME HOW EASILY AN INCURSION INTO THE CLASS B AIRSPACE COULD HAPPEN AROUND LUNKEN FIELD. THE CLASS B AIRSPACE JUST 2 MI TO THE W OF LUNKEN FIELD HAS A BASE OF 2100 FT; WHILE THE BASE IMMEDIATELY SURROUNDING LUNKEN IS 3500 FT. (THE CLASS D LUNKEN AIRSPACE HAS 4 DIFFERENT BASE LEVELS OF CLASS B AIRSPACE IN IT OR ABOVE IT). MY PLANE WAS NOT OUTFITTED WITH GPS; BUT I DID HAVE DME. UNFORTUNATELY; SINCE THE CVG VOR IS NOT ON THE FIELD; MY DME WAS USELESS IN THIS EVENT. I RECOMMEND MOVING THE VOR TO THE CVG FIELD TO BETTER AID PLTS IN LOCATING THE BOUNDARIES OF THE CLASS B AIRSPACE. THE SECOND ISSUE CONCERNS THE SUGGESTED VFR FLYWAYS ON THE VFR TERMINAL AREA CHART FOR CINCINNATI. THE NE FLYING LINES UP PERFECTLY WITH THE PARALLEL RWYS OF LUNKEN FIELD. THAT MEANS TFC IN AND OUT OF THE CINCINNATI AREA AND LUNKEN TFC IS USING THE SAME AIRSPACE. THANKS TO THE LUNKEN TWR FOR KEEPING WATCH. THEY RPTED TFC TO ME AT 12 O'CLOCK POS; AND I HAD TO TAKE EVASIVE ACTION TO AVOID THE INCOMING ACFT. THIS INCIDENT OCCURRED ON THE OUTER RIM OF THE CLASS D AIRSPACE AT APPROX 2700 FT. MY SUGGESTION WOULD BE TO MOVE THE NE FLYWAY SO THE LUNKEN TFC ISN'T ON THE SAME COURSE. UNTIL THESE ISSUES GET CORRECTED; I'M GOING TO AVOID LUNKEN FIELD.