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Hi Cluster,
it seems your focuser may be off a bit.
You should remove the secondary out of the way (just rotate it 90 degrees) and check with laser if the beam hits the tube at the point opposite the centre of the focuser. If this is not case, then you can explain what you are experiencing.
However, for your troubles I am sure the mirror is not the culprit, it will be eyepieces and/or barlow. The chromatic aberration visible on the planets shots is proof of what I am trying to say (mirrors do not have CA)
And, besides, the focal length is only 750mm and I think you are expecting too much from 780mm FL in terms of magnification - I would not go beyond 150 or so.
Anyway, at that Astro. Soc. meeting you can try the eyepieces other people have.
My mind was blown away when I tried a really good eyepiece on my 10" mirror, I never suspected it is that good...
Affordability of such eyepieces is another story hough....
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