wish I had caught this thread before you transplanted. Any way from what I remember from plant science, schultz is pretty good, mg was always thought of as a do not use.
Hope you moistened the potting soil before you put it in the pots. The peat moss, if not moistened before hand, will actually repel water.
The seeds contain enough stored energy to feed themselves for maybe a month after germination. So no nutes for at least 2 weeks.
if you still have the old pots, crack open the soil and see if the water penetrated the whole of the soil. If not, and you didnt moisten the new soil first , you know from the bag into the pot,you may end up with the same issue.
If the old soil was dry in the middle and you think the new soil will also be dry just give them a good watering, wait 10 minutes and give them another good watering to fully wet the soil to the core. Once this is done you can then continue with a good watering schedule.
good luck
ps. short and bushy is waaayyyy better than long and lanky!!