Another round of tweaks, and I managed to undo the new problems I created in the last round. This is better, although I am still stumped by the horizontal wrinkles at the waistline area. The canvas is starting to show all the seamripping and resewing I have been doing to it ... and I still cannot get a lacing gap in back. I'm debating the merits of trying a third fitting muslin in size 12 ...
So now the big question is whether or not to do up a third fitting muslin in yet a smaller size in the continuing attempt to get a lacing gap in back. Oh - I keep forgetting to post up my waist measurement in this corset (I remembered to measure yesterday) ... it's only 33 inches (uncorseted I am 35-36 inches, depending on water retention). It just looks like more.
I may just go ahead and whip one up, because this really is comfortable ... lots of back support without bust compression. Then I can come back to it to tweak the fit more ... this is tempting, as I sit here typing in the fit muslin (long cable ties and all!).