The most important things in successful cloning is consistency you gotta be on point with the temperature u plan to keep them in an create the right humidity they can cope with usually for first week 80% an soaking your Rockwall in a PH adjusted clone nutrient solution an foliar feeding them...
If your plants are healthy then transplanting shouldn't really be much of an issue just doit as gently as possible id give the 2 small ones few more days if not weeks an if ya got bigger pots ready id not stress but transplanting is never a bad thing they love a new space to get up an going just...
Do u have an exhaust fan running? If so you'll find ya co2 may be having very little effect depending on ya room size an temperature levels i found sealing the room an running exhale bags helped my veg cycle heaps