Hello red Dog,
I'm currently working on the same part of the wings on my Monogram A-6 build and specifically focusing on the DECM bulges. Although Monogram included these bulges, they aren't exactly shaped correctly. I built mine up with Tamiya Light Curing Putty in the areas I felt the shape was deficient. The shape of the bulges is pretty complex so getting the contour just right may be a bit challenging and time consuming. I've literally been on this part of my build for quite some time as there is a lot going on in that area. Also, a note of caution. Both the left and right DECM bulges have small protrusions located at the front end. After many hours of staring at my reference material I noticed that their location is slightly different on each wing. One is located more inboard than the other. It's hard to tell but if you notice their location relative to the panel line adjacent to the protrusions It's easier to notice. However, I suppose there is a chance both protrusions are located symmetrically and It's the panel lines that are located differently and hence give that illusion.
Here is a pic that may help.