We went the other way and moved the whole thing to a different assistant, not just a different model in the same app. Not because the new drafts were unusable, but because I was done with checking every few months whether the tool still writes the way it did last week.
The one we use now changes too. So I will not pretend it is the final fix. It just happens less often and so far less drastic.
Atif, the examples in the instruction sound like a sensible setup. But for me it is still the same app deciding when the ground shifts under you.
I would rather pick the tool for how little it moves than keep adjusting around whatever the model does this month. Different priority, not saying yours is wrong.