i can help here. heres some pics of some autoflower lowryder i am growing and lst'n. they are about 42 days or something and wont be ready for another 2 or 3 weeks at least. if you top it realize that no matter what kind of plant you top, itll stunt growth somewhat for a certian amount of time to heal the wound, then it will resume growth. from my experience i noticed slow growth anywhere between 4to10days after i top my plant, just depends on how strong the genetics of the plants are.
not sure if you can clone them... would assume that if you tried they would just keep flowering so i have never tried.
lst'n dwarf plants is awesome to open up some of those hard to get areas where light cant penetrate, i also like to cut off the node/fan leaf sets toward the bottom of the plant that wont be getting much light.