Fastbuds grow

Well, I gotta say I am sort of happy with the kosher cake, 1 has had decent growth, the other is slightly better, but I’m not happy about the size of the purple punch. Once again my autos have gone into flower at such a small size. I must have asked and inboxed at least 25 different growers, heck I’ve even reached out to Fastbuds but have gotten nowhere. HOW DO YOU GUYS GET THESE HUGE AUTOS?!? Am I not watering enough? I am very careful not to over water! am I not using enough nutes? I use 20/4 light schedule, my temp is 22 degrees Celsius humidity 60%-65% consistently. My light is excellent quality, I’ve tried 3 different grow mediums. Always the same fucking thing, barely any size then goes into flower. Should I avoid LST? I just don’t know. ANY INSIGHT IS WELCOMED AND APPRECIATED!