what type of high are you wanting, i have a theory about the number of weeks flowering they give you on the pack. if you want a rushy high then you can chop now, but if you have a hankering for a real couch lock high, then wait it out.
when you see the photos from the seed companys, i think thats a racy high time to chop. and just what there looking for in a smoke in places like amsterdam. they dont want everyone to be couch locked as people wouldn't mingle, drink and party. so by chopping early, they give you that get up and go high.
Amsterdam used to sell some amazing puff. the nepalese temple ball was a real temple ball, that had matured with age. hash thast made you part of the furniture you were sat in. good times. you may still be able to find decent hash in the dam, but its not so available as it once was