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Seems like you're getting unnecessarily confused by technical aspects of eyepieces Paul. A 34mm ES 68 degree with a narrow band filter would be good with your scope accompanied by one or two 82 degree shorter focal length ES's.
I tried the 6.3 reducers a few times and thought the contrast suffered in comparison to using a longer focal length eyepiece alone.
The 31 nagler and ES30 performance is very similar in the scopes I've used them in.
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