I can get close. The trick is leaving enough of a flat zone where the curvature of the tabs inflects from the curvature of the main portion. This might go against your design intent however, so there might be a way to do it with forming tools, but if you want a flat pattern, this is a good way to do it.
Attachmentssheetmetal part.SLDPRT, 400 KB
yes, i was thinking the problem was because of the size of the part and how tight the radii are. but i'll play with it more base on what you whipped up. thanks for the help.