Yeah, I might give that a go, but I have four new crossies in the propagation crib... So I am using it right now..
Why are you going so early with the PK 13-14? Why are you being so impatient? It wont work that early... It says on the bottle for plants with an 8 week flower and you are going to flower yours for 9... It doesn't matter how long you flower for the important thing is the window of 5 -6 weeks... But if you want to use it at four, go right ahead, personally I wouldn't....
Just be patient....
Laceygirl....