I am really pleased that your babies are doing well!
If I recall correctly(unlikely though!!!!!!!!) you previously asked how to stop getting overstocked, so as long as you are getting 'SOME' of the babies survive, rather than all, that should help with that issue?
I rarely see shrimps spending time on my moss either, they spend more time on other surfaces. IF you want more babies you should use some powder/baby food, though if you have 14 babies already and don't want to get over-run then I would leave it alone, you must be doing it right, and messing with things can just cause a problem when there wasn't one to start with?
They will have more babies and eventually the babies will grow and have babies so just let it naturally happen that the colony grows!
Simon