[Sew Over It 1940's Tea Dress] – Fit adjustment fo Sewing Machines Parts and Sales in Los Angeles

I’m working on this pattern right now. After doing a 1.5″ FBA to the bust panel, I noticed that, although there is enough volume, the panel isn’t long enough. What is the best way to alter this pattern to lengthen just the bust panel (so that the seam ends under my bust (essentially, on the bra underwire)?

These are the instructions I used for the FBA. In order to lower the bottom seam via the FBA I currently have would involve increasing my 1.5″ FBA to a 3.5.” I’m currently considering just lowering the small piece at the center bust even further than needed for the FBA and then redrawing the lower curve to give me the extra inch+ I need, unless someone has a better idea.