Definitely, the back needs a sway back adjustment here.
I never did figure out the Burda instructions and mainly used the tutorial by Dawn. I did finish the sleeve in different manner so that I could avoid "tunnel sewing". As Dawn pointed out, the most critical aspect is only sewing from notch #5 to notch #5 on the front and from notch #7 to notch #7 on the back. (You can see from the picture that I did some ripping. A bunch of lumps occur when sewing the seam at one time.)
Who needs to do puzzles to keep the mind working when there are pattern instructions to figure out? My greatest learning from this garment: I'll be sure that I can visualize the entire garment before putting it under the sewing machine. If I'm really confused like I was with this blouse, I always can sew a Mini Sample or stop be cocky and sew a muslin. I would have saved time with this project!