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The 42mm and the zoom will cover the useful range of the 8"SCT, while the short plossl and the zoom cover the useful range of the small refractor, so you already have the possible range of focal lengths pretty much covered.
I think you are at the point where the next quantum leap is to sell all three eyepieces and replace with three, maybe four eyepieces that are higher quality, wide field ones, either LVW, Panoptic, Radian, Nagler or Ethos.
At the short end I think the plossl you have is too short for both of those scopes and you'd get more use from something around 6-9 mm.
At the long end the SCT can take the biggest widefield you could stuff into it, but the refractor will be maxxed out with a 30mm.
So to me that suggests a set of set comrpised of 7mm, 12-15mm, another 25-30mm and maybe keep the 42mm if that has a field of view as big as a 2" barrel allows.
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