Distance from light to plants and the height of plants

HI bud. If raising the intensity was a good idea, is something only your plants can really answer. The real question is, what was your intention behind raising the intensity? I wouldn't say they are small. Perhaps a little thin but that could also be genetics. I think you are being a little impatient. Let them do their thing in their own time. They'll let you know when something needs done. Hope this helps, even just a little.