Winter Grow Fastbuds multi-strain

week 4, day 23 I topped the Tangies and the Crystal METH early last week but left the blackberry alone since its not really growing. Im starting to get worried about this blackberry - In my last grow the retarded blackberries were growing more then this one and eventually fruited some decent nugs but Im worried this one is going to become a total failure.. If it doesnt grow out of this retardation soon im going to pull it and plant another Tangie because this is too early in my grow to allow this space to go wasted. I rated these blackberries a 9/10 because I just blammed myself for all the retard plants I had last grow and one came out great but Im having even worse problems this grow with this one even after fixing what I had thought I done wrong so instead of continuing to blame myself Im going to blame the genetics and I wouldnt rate it 9/10 if I was doing it today thats for sure. Sorry kind of a rant. The other 3 plants are doing well but seems like this soil may be a little too hot for them but its not effecting them too bad.