Hi Dave
I used an 8" dob for a few months before moving to the 12". Using the same 2 eyepieces I would estimate that i had the 10mm in the focuser less than 5% of the time. With the plossls that come with these scopes anything shorter than 15mm is very hard to use and needs perfect conditions.
In my 12" I have a 13mm TV Nagler and a 24mm TV Panoptic which are both magnificent eyepieces, although a significant step up from the plossls, even the 13mm needs pretty good conditions to give nice views.
There almost certainly isn't anything wrong with the EP, just persevere with the 25mm, I did almost the entire Messier list with one in the 8"!
Malcolm
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