It just needs more light. Move it closer to the light or get more lights. It's not going to regain its original shape without beheading it, however.

Echeveria subsessilis is the correct sp. Did it have name tag when you got it?

What does it mean: fairly good watering cycle? Soil in the pot seems to be very dark, it usually indicates that it is too wet.

Keeping plant under grow light for 6-8 hrs may not be enough - I have lights on for about 12 hrs. Do you know wattage of your light and kelvins? (Maybe it is a LED light? )