I HAVE DEFEATED THE SPOOGE....
Alright, here is my take on the black spooge. I used (about 10 years ago) to have it on all my bikes, I don't anymore. When I used to run Golden Spectro which is fully synthetic, (and is a fine oil) I would run it like it says on the bottle, 1 bottle to 4 to 6 gallons of gas. That translates to about 42:1 to 64:1. I always got the spooge. Then I started mixing it at 32:1, which is more oil than the bottle says, and the spooge was much less but still there.
Fast forward to 1998. I got my new bike and started running Maxima 927, another fine oil at 32:1. Got the black spooge again. So I called the guys at Maxima. They were very helpful. They said the 927 (fully synthetic) was designed to burn at very high engine temperatures it has a high flash point. They kindly explained that it seems like my engine wasn't getting hot enough. I said I understood and know I will NEVER ride like Ricky Carmichael. I went out the next week and rode totally over my head all day keeping the bike revving high all the time. I was trying to keep my engine temp high. That kept the spooge away, but I felt the ambulance getting closer so I called them back to ask for their advice. They recommended that I try Maxima SuperM which is a synthetic/petroleum blend and has a much lower flash point and still gives excellent protection. He said that the natural part of the oil will burn at a lower temp, and the synthetic part will protect at higher temps. I made the switch and the spooge is again gone . I would try the Maxima SuperM at 32:1 and see how that does ya. I would also repack your silencer because it is probably filled with oil and rinse out your pipe, it is also probably filled with oil. If you don’t clean the two of those out, the Maxima will not look like it’s working until your bike pumps all the old spooge out.