Your seals look good. I would no go the route of cutting and adding Dicor, that would be taking a step backwards. If you want to be really sure then cut out 2x2 squares out of eternabond and paste them on top of each screw head. Now the heads are double sealed and unless someone stands on and grinds their shoe on top of a screw the eternabond will hold.
Also did you use a roller of some sort to really smash the eternabond onto the roof? Your edges don't seem to show any sealant squeezing out so I wonder if you pressed down hard enough. You want to make sure it is pressed down really firmly or it will leak.