I have a 380 dancer with about 500 hours on 8.1's. They run very well, but I do notice some black exhaust "soot", which accumulates around the above-water exhaust ports. Sometimes at idle they smell like they are running rich, too. Oil testing shows no fuel residue. I'm wondering what other people's experience having injectors cleaned has been. Do you think that this would help the sooty exhaust issue? Do you find that having the injectors cleaned has saved you any fuel? Again, she runs great, so not noticing any performance issues. Looking forward to your thoughts. Thanks in advance!