hey there funky monkey,like vegasgrower said you should get hold of a magnifying loupe that is 30x to let you see the trics well enough to decide on the chopping time,ive put a pic in of trics at different stages,i know youre well aware of when you wanna chop but its a handy lil pic to have,
ive also put a link to a page on ebay where you will find the type of magnifier youre after no problem at a very cheap price,happy growin m8

http://search.ebay.co.uk/magnifying-...W0QQsoloctogZ9