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Gary,
I am at a loss, apart from the lead that Bert has you on, and he could be onto something here as the majority of the weight will likely be at the rear.
If he is right, perhaps some spacers to fit between the triangle, and the inner edge of the tube.
Could it be a too healthy dose of silicone, rather than a smaller amount. And this "blob" is flexing? I too used silicone to affix my 8" f5 recently, and after placing the blobs I put a series of tin cardboard next to them to give me a "measured" thickness that was also consistant for the three of them, just a thought.
Gary
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