sometimes amber trichs come from being wacked and whatnot..
try letting one grow to at around 70 days and then judge the trichomes later. You will get better weed by being patient and letting them ripen for 4 more weeks, as hard as it may seem to do it will be worth it. You are seeing pH problems or cal-mag already and your real goal for harvesting at around 70 days is to keep them healthy.
They look nice but you will see alot happen in two more weeks then just let it go for longer, I forget but I think gorilla strains are usually 60-65 day strains. If you fuck up it can be longer