Welcome Gavin!
8" newt is a fine choice for your next scope, I reckon. I use mine (Skywathcer 200pds) on a gso alt az mount that is something similar to the Twilight... It vibes, for sure, but for me it's manageable and it doesn't ruin my session. If allowing 3+ seconds for the set up to settle sounds like a hassle, maybe a 6" would do better?
I also enjoy sumo
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