I once suspected that I had a cracked frame at the base of the seat tube in the area just above the lug in your first photo. I called the builder of the frame and they sent me to a shop that was local to me for inspection. The shop mechanic pulled the seat post out of the frame, grabbed a flashlight and pointed it down the seat tube while cupping his hand around the top of the seat post and the flashlight so no light would leak out there. They turned out the lights in the room and we could all clearly see the line of light leaking out at the area where I thought the crack was. It was a tig welded Reynolds 853 frame and the builder admitted that they had made some changes with the building process on the newer frames. Only frame I've ever had crack on me and I've always been north of 180lbs, at times well north! Anyway, maybe that method would work here too.
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