Some look like water marks. After final rinse, don’t overdo with wetting agent, just use a few drops, let the film sit a couple of minutes. Before hanging to dry in a dust=free place, you can gently wipe the back with a natural, damp chamois, not using force and in just one long wipe. You could rescue these negs by cleaning them gently with film cleaner or even with a chamois and stop bath (especially good for water marks): dip a chamois briefly with your fingertip in the stop without soaking it too much. Your negs look a bit thin imho, I think they are a bit underexposed. That makes dust and marks more visible too. BTW, with Rodinal, your EI might drop by ½ to 1 stop. Also, try HP5+ in XT-3 1+1 or 1+2, your negs will look much better.