Dude this is what I do using jiffy peat pellets,sponges,insulation,rockwool basically everything except cuts rooted into the soil which imo is the best way to do it.Soon as ya see roots poking out it's all good,least it werks for me.
Take them outta the dome and put them in a bucket of water,completely under.
Yes the whole damn thing,let sit for a minute roughly then plant and water into soil.
This will really do a lot to prevent any major wilt issues and almost makes hardening off a non issue.