Advice needed - Coco A+B/MonsterBloom/BudXl

Hi all..
I have recently set up my first grow with a mate over at his apartment, been given basic advice and read up on alot. Their currently two weeks into flower with no problems.. buds starting to form nicely. At the moment im using Coco A + B along with Monster Bloom.
I also have BudXL, the bottle says use from 6weeks. Does this mean use from week6 to harvest??
Im thinking of going out to pick up some PK 13/14, along with Canna Boost.. Just wante some advice before i spent more money, if any one would recommend these along with the other nutes?
Looking forward to any replies, and any help would be greatly appreciated.. Cheers

Bump - C'mon some one must have some extra knowledge about these nutes....

yes mate budxl in the last 2 weeks.. thats what i do. remembering its not an exact science, re. finished product time.
use for the two weeks prior to flushing

elenor.rigby said:

yes mate budxl in the last 2 weeks.. thats what i do. remembering its not an exact science, re. finished product time.
use for the two weeks prior to flushing

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Thanks for ur info m8 I was wrongly advised to start when buds begin to form.. and have been using budxl at half dosage for around a week.. this shouldnt be a problem should it?
And could anybody advise me if its worth getting pk13/14 for week 5/6, and also canna boost? (or any good alternative) As ive read only good things about these products.. And would that be ok to use alongside A+B/Monsterbloom/BudXL?
Sorry about all the questions.. but id rather advice from experienced people rather than people who wrongly inform me!
Thanks for any additional info!