With the new set there are a few cards that make manacles + solitude work much better, the new wisp is awesome as is the market for geetting your missing pieces.
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Fallen Oni makes it 8 targets for Shadowlands Guide and Press-Gang, worth considering. Also, a Lethrai Provocateur(or Umbren Occluder) in the Market is reeeeeal fun.
Yeah, I was using Fallen Oni before FoA and replaced it with wisp, I don't think you need that many 1 drops, the wisp + recursion makes solitude actually playable quite reliably, I had tough of the Occluder and thought i was too slow, but didn't think about putting it in the market, i'll have to try that.
I agree that wisp outclasses oni here, but I found that running both was more consistent for my build and lead to shadowlands guide getting value on turn 3 more often. Since you run 4 guides there are going to be plenty of times where you draw it before you have a target in the void. Then again, your draw package is different than mine (and you aren't running torch or any fixing) so maybe it plays out differently for you.