They seem fine like this, plus the dripper isn't too close to the stems, i'd let them like this for a week maybe. Then slowly increase the watering schedule. And after a few sets of leaves, they should be big enough to take away the timer.
But from my experience in this system, and no matter your watering schedule, the roots WILL grow in the reservoir and clog the drain holes. So drilling extra holes is, to me, needed, and the plants will be able to grow their roots in the solution like in a hybrid dwv - air pump is required though.