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Hi Steve,
The triangular shapes in the stars, whilst possibly due to some coma, are also indicative of astigmatism and other aberrations related to "pinched" optics, where the optics, the mirror in particular, is too tightly held or clamped in position to the extent that it slightly distorts the mirror's shape and results in the aberration. Relaxing the retention of the mirror should improve things.
One of our members here, Bojan (Hi Bojan) has done this to one of his Russian Mirror lenses. As I recall there is a thread on the process, which should steer you in the right direction
Best
JA
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