Focus just takes time, and while I use FocusMax, it is no magic bullet. The focus can be obtained just as well with the sub-frame method, so persevere.
Flats are not that hard. In my case, when I had a refractor, I built a light=box. But with the 8" I simply point it at an interior wall, illuminated by a set of fluorescent tubes, and shoot these as I pack up. Try some and see. If you are always using the refractors, then consider building a light-box.
Think twice about opening it up though, learn to live with the dust, unless it is very dirty.
Gary
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