Mine does the same thing. I took my silencers off and the shit drained out of them. It was like a thinned oil gas mixture. I dont know if its too rich jetting or what. Mine was coming out of both silencers.
My Mods Are In My Sig. Almost Same Setup I Am 927ft. Above Sea Level. Im Running 280 Mains 27.5 pilots. You may need a little richer due to your elevation.
Center Punch Your Bolt First, Then If You Can Get A Left Handed Drill Bit A tad Smaller Then Your Bolt, Sometimes They Will Back Out While Your Drilling It.