QL77JC4's gapped at 35 work well for me, but I rejetted mine due to the loading up at idle as well. Try a set of 32's in your idle circuit and stay with your current plugs. The QL78YC's are a longer reach plug, but may actually load up worse as they will be pushed furthur into the air fuel stream. I know I ran them before and they didn't seem to run as well. Also buy your plugs at WAL-MART, there about 1/2 what most places charge.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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