I have a scope of similar focal length and can say that you may be looking in the wrong direction.
My first set of eyepieces were the following
4.8 Nagler 215x
9mm nagler 113x
32 Plossl 32x
I still have these but do not use them so much.
Now I use
7mm Nagler 146x
13mm Nagler 80x
27 Pan 38x
I also use a 2x ultima barlow, which I can highly recommend to you.
To me its all about field of view - not just the magnification.
Even with an Apo refractor, I do not use high magnifications much.
The conditions are just so rare to enable their use.
If you only have a decent 9mmm perhaps you should look at something like a 19 panoptic.
If you are determined to go high mag, how about a 5mm Radian?
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