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M6 oiling system or clutch

2007 M6 is getting a slight bog, not too much performance wise but from what I believe to be loading up with oil at low rpm cruising speeds or idle.

I have to change the plugs once or twice a season and they come out somewhat on the black side, and even had one carbon up making it run on one cylinder. After I cleaned the APV Valves it helped but still maintains on the oil rich side with a noticeable down low bog. My dealer says to leave the oiling system alone and go with lower grain weights such a 65g weights to soften or cure the bog and change plugs more frequently just to be on the safe side of oiling the engine (Bought in North Dakota came with 70g weights).

My question is what do you guys think oil issue or clutch weights?
 
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