There is no "normal" speed of growth it 90% depends on genetics so as long as they are healthy, dont worry! Did you mix your soil with some perlite or vermiculite?
Those look good for only being under two lights, try and get an extra light and dedicate one light to one plant. Also get the lights about 2-3 inches away from plants.
I use suspension curtain rods. ....the kind you twist to lengthen/shorten. That way I can move them anywhere in the closet. I also use one to hold the electrical chords away from the lights and plants.
I've also used household lamps/lights to improvise and got creative. Not the best setup, but it works. As soon as I can I'm going to go get more of the clamp on lights, but in the meantime, the household lamps are working.