Spacers on rear rack look allright?

I generally don’t recommend this, as it amplifies the effects of downwards forces acting upon the bolt farther away from where it’s anchored, particularly so as loads increase, or terrain worsens.

You are the best judge of you, however, and if you think your loads will be light enough that it won’t be a problem, by all means, go for it.

But no matter what you do, if I were you I’d still be checking those bolts for bending at regular intervals just in case.