I ripped out the hip gores, bumped them up an inch, and pinned the mock-up on. The waist wrinkles were smaller, but still there. Raised the gores another 1/2 inch and put the mock-up on one more time.
At last. The gores need to be lengthened and reshaped since the corselet is now loose across the backside, but I think the big fitting issue has been solved.
Question. Should I be concerned the way the grain angles on the side panel? It's straight at the bust where it's snug, but below the waist it angles to the front. What to do?