Here's an update.
This morning I did all the above (except the repeat part) and found that only one of my roos had a raw bottom. His rear was red and rosy under all those fluffy feathers. Raw as hamburger meat. I felt so bad for him. So after I bathed him and put Vaseline on his feet, comb and wattles, I also greased his rear for him. Hope that helps to soothe the irritation.
None of my girls had red vents, all looked nice and pink and healthy. No signs of eggs on the feathers around the vent. I did have two that had a patch of broken feathers on their back right in front of the tail, and looked like some scabbing on the skin. But I bathed them all in flea shampoo anyway and put Vaseline on their feet. I told them today was a special day because they were all getting a bath and a foot massage. They decided I should get a bath as well and I ended up soaked. I think this was a two person job.
I'm not sure if they have lice or mites or what but I feel like this might have nipped it in the bud. I'll repeat in a week or so. Until next time then...