What kind of cat are you using? Stock Civic one, GS-R one? Was the P28 you were using a stock P28 SOHC VTEC ECU or was it chipped for a DOHC program (Skunk2, JUN ...). If it was chipped, that might be it. Those programs tend to run incredibly rich to compensate for a pair of extreme cams so that might be why your so off. See if you can find a stock P72 and retest. Also, if possible, try to keep the your engine/cat warm before they do the sniffer test. Cats take a while to heat up and work properly. I'm sure they take that into account while testing (I'm in PA and I have zero emissions testing) but something to try. Seeya.