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Welcome Cam
Can't help with the specifics of your scope but:
1. Don't use graphite powder. You would never get it off the mirror.
2. My 200mm scope only just handles 220x mag. No chance of ever reaching 300x with the smaller scope without the image being a fuzzy blob. Resolution of a scope is proportional to the aperture, so the smaller scope will not magnify as far. The scope is not really optimal for planets but should give nice views of clusters etc at the lower power.
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