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You're definitely getting there Peter! Well done!
Yeah, never waste your time doing OIII on galaxy shots. Even Ha can have little effect unless there's a lot of HII emission going on. Even then, only apply Ha to the galaxy (limiting to the emission elements if you can) and not to the whole frame, so your stars retain RGB colour.
Also think about doing a bit of deconvolution to reduce star bloat and add detail. Careful though, it's easy to overdo decon.
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