While there is nothing wrong with housing your ball pythons together, there are some risks involved. This topic has been discussed at length on this forum so I won't get into the details. In my opinion, you have your husbandry down and you have your tank set up in a way that is fairly suitable for multiple BPs. If you have experience with snakes, cohabitation can be done.
I'm under the impression you got some of these snakes fairly recently which leads me to believe that you did not quarantine them. So if one of the new snakes has some sort of illness or is carrying mites or other parasites you put them all at risk for these illnesses and parasites.
Just something to consider for the future. I am glad to hear you plan on separating them when they are older. Please keep a close eye on them while they are living together.