I've been using the PK 13-14 for a while and I love the stuff. I use it through week 4 and 5 of 12/12. It really seems to assist in the bud production, I mean the difference is amazing after those couple of weeks when using it. Buds will double in size from the PK. I used it in my last documented grow and you can see the benefits from the pics in the journal.
I haven't tried the boost acc' yet but I'm going to. As I understand it's more of a finisher that gets used at the end, but I'm not sure because i haven't done the research. Definitely get into the PK though, it's about the right time for you and it's fabulous stuff. That should get those buds moving along.