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Hi Skygawker,
I am having very similar probs with my homemade scope - collimate as best i can with cheshire only to find worsening coma toward the edge of field. I've ruled out the eyepiece as the cause as its a televue plossl which have a very good reputation. Mirrors by Suchting so they're not contributing to my probs. I'll be watching this thread with much interest to see what other advice the gurus have.
I have just replaced my standard bintel 2" crayford with the low profile version because much like you i couldn't see all of the primary in the secondary and it's going cheap. PM me if you would like to upgrade your focuser.
Steve
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