I had a runoff thread myself getting started with coco, heads up people are quick to say dont worry about it, lots of threads on that with credible growers saying its about what goes in.
Not see anyone mention yet about the root bound, you can cut a chunk off if you want, it prunes and makes it grow a new pattern of roots, u doing the binding. next text below solves any transplant concerns.
I would suggest doing seedlings in solo cup for a week with low EC then go into final container. just cut the cup so it gently pots. it will fill in the final pot very fast, exploding in growth above and below the whole time including autos.
it knows when its pot has upsized, and will shred right through it. many here advocate str8 to final container. the one week in a cup tbh just helps save nutrients and time.
I tried transplanting 3 times, just slowed growth, root bound and just seems like i had better growth with the plant knowing it has a container to fill from the get go.
nice gig going on! nice plants.