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The sustainer fins also look larger in the pictures (there is obviously some perspective distortion going on here but they still look taller).
You obviously have some decent modeling software. Why don't you model up a 45-degree LE for the fin and then get a perspective view of the assembly that matches the viewing angle of this photo? If it looks like the picture, I think you'd be on track. As a preliminary step, you might try adding another red line to the non-vertical sustainer fin tip in the photo and see what that looks like.
Ah, also just noticed another photo from the 2nd page of the brochure above that shows the sustainer fin fairly square on. Unless some photo manipulation is going on this looks like a photo of the 3-fin sustainer. It also looks like the 45 degree sweep angle for the fin is more accurate proportion.
I don't have any confidence I know how that thing is clocked. But I agree 45 degrees looks better.