Don't be too dismayed. F5 or 6 Dobs aren't exactly 'crisp star' friendly without exceptional seeing, or low magnification.
The more you bump up the mag, the more crap you magnify as well.
Diffraction spikes are good!
It is weird though, F5 can get Joop, Saturn, Nebs, Globs etc looking fantastic, then aim at a bright star and it just won't focus quite right. Even the best collimation can't see pinpoints thru gunk.
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