Autos, hybrids can be totally different phenos, like sisters and brothers in a human family. You seem to have a good environment and they look healthy. I'm about to finish my 2nd grow/1st autos and my plants were 4-5" inches tall at 12 weeks. I'll be lucky to get an 1/8th ounce out of one NL dwarf, after drying and the stems' weight subtracted. I understand expecting what you see in pics but some of these folks have been growing for decades, experience, knowledge, or it's their strain, or light. Sorry, could be better could be worse. Trust me. You still have time on this one, it'll get better before it's done.