Interesting, i cant give you an exact reply to that because i have the SW 10" which has 8 primary mirror clips. in anycase it shouldn't be affecting the middle of the mirror. its almost as if you have diffraction spikes coming though. very odd.
Other things with your collmination you shouldn't have to move the primary up the tube to get your secondary centered. also is your laser collminated.???
Collminate so that your focal point is just where the camera can reach it so its not hanging out on a limb so to speak!
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