Kim, it’s a tricky one, as I’m sure you appreciate.
There are so many factors involved that are beyond our control. The biggest wildcard is undoubtedly the weather.
If you’re unhappy with the results you’re getting from the 120, a new camera may not solve the problem.
One thing I would try, given your focal length with the Powermate, would be to try it without, and perhaps with a different Barlow multiplier...say 1.5x? It could be that the atmosphere just isn’t giving you what you want, and reducing the effective focal length might give you more promising results.
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