As long as everything is tight, I wouldn't be too concerned about doubling up the attachments. On my LHT, the dropout attachment is doubled up with the rack and the fender stays without issue. I see that on yours, you've used a bolt that extends to the inside of the dropout eyelet. You probably have room there for a nut if you wanted to go for overkill on that attachment point.

I would also strongly recommend using the blue thread locker; the rack bolts tend to be a problem area for vibration loosening in my experience.