Are you sure you don't over-under water ? .... Make sure that ventilator doesen't stress the plant... They don't need all this honestly whne they are so young ... You shouldn't transplant .... You transplanted without reason and stressed the plant ( been there , done that ) ... Transplant the next one only after she gets some good roots so the roots can hold the soil together and it doesen't break... Make sure you don't water before transplanting so the soil gets dry and easier to trasnplant........any light is good enough for now , they are small ... Just do the basics , water , patience , water , patience....