I think I might have it, now. Thanks to the few people who offered some advice... my grandmother and Steph, in particular I have come away with an epiphany. Well, maybe several. 1. You don't have to know what you're doing to figure it out. Trial and error is the only way to learn 2. Simpler is usually better.
So, here's the gameplan after more muslin alterations.
1. Move bust dart in princess-seamed side panel up about an inch.
2. Rather than doing an SBA on an armhole princess seam, I'm simply going to remove a sliver of fabric from the center front seam - about 3/4 inch at the top, tapering to nothing at the waistline.
3. I will make the petite adjustment at the waist
4. Add a bit of bum 'wiggle room'... I think about 1/2 inch should do it just fine.
Round 3 muslin coming soon.
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