You know stank, I am a real believer in the test bud if you are unsure of whether you want to harvest or not, especially if you have a sativa and want that nice up buzz. Like Rosebud, I always take my Satori at 9 weeks, but Satori is a fast flowering sativa and I need all the help I can get to get up and moving in the mornings. Like Hackman, I don't really want any amber on my sats.
However, Northern Lights and Skunk 1 are not sativas--the NL is almost all indica, something like 90% and the skunk while a hybrid is still heavy on the indica side. I really would think they really should be ready by now unless they were not sexually mature when put into 12/12 or you had some kind of stress or not enough light that caused them to go longer.