Hi, I see this post now for the first time. Sorry I'm late to the party!
Congrats on growing them so well. I think you are right on your plans.
Separate them out if there are enough roots and the entanglement isn't too bad. If left alone as a pack, smaller seedlings will get further weaken from being shaded and getting bitten out in the competition.
By the way, I'll have to share a bad news. Looking at those seedlings now, they are not what the tag says.
They are Norito Hasegawa x fairrieanum. There must have been some mistakes at the lab. One of my Wilbur Chang x Mystic Isle have also turned out to be NH x fairrieanum. The leaves are very much telling and I can tell you this with 100% assurance.
Sorry about this but when the seedlings were tiny, I couldn't tell them apart and also I had total trust in what the lab label said.
Hopefully some of those will turn out to be a nice version of Jade Dragon or Golden Diamond.
My seedlnigs have been growing along very nicely too. Good batches!