The silicon does not make any difference. I had to remove the mirror from my steel tube several months back and reinstall that into the new truss. I found that the cause of the triangular shaped stars is the tightness of the baffle tube against the primary. You need to make this just touching only. It should be just barely touching and nothing more. Keep backing if off until you get good shaped stars. Be also aware that the primary mirror locks need to be snug but not over tightened too. The mirror clips should not be touching the mirror at all.
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