That's a lot of snakes, in a short period of time, from several sources. I know you haven't been in the hobby for a while so you should look up proper quarantine practices. I'm not sure how you'd swing it with that many animals coming in so quickly - maybe a different zone for each source of your snakes.
I would worry about getting the collection 100% healthy and problem free before breeding. Most folks wouldn't be interested in picking up anything from you if they knew you were having these issues. Might as well multiply that by 1000 until you determine the cause of these RIs, which are just as likely an underlying condition for something nastier.