I'm a strong believer in going with what works. You've seen the moss work for the others, and this isn't working. If they don't have roots you won't damage the roots by moving them. Of course, you want to be very careful in case there are tiny roots started that just haven't gotten out where you can see them yet, I don't wait for much root before moving them up to a soil mix. I don't think it shocks them as much if they haven't settled in, And, if they're in a soilless mix they're building roots out of reserves in the stem, I want to get them feeding ASAP. I use willow water on the ones that are slow to root, don't know that it helps but it gives me the satisfaction of doing something.