I was just looking at your diary pal and from first seeing white pistils (day 25) till day 50 when you say you are gonna flush you have only has about 25 days 3-4 week. That's not long enough. I'd say 3-4 weeks minimum.
The best way to tell by far is to look at the trichomes through a magnified lens, phone, jewelers loupe. Preferably x50 at least.
When the little heads on the sparkly mushrooms change its indicating colours you can accurately harvest.
Not pistil hairs. Not what the seed packed said. When the trichomes are clear/ translucent it isn't ready and harvest now will not be as strong and the buzz will be more 'speedy'.
After clear comes milky. When mostly milky this is about peak strength. They then turn amber. This is thc degrading so don't leave too late but have 10-15% amber for a less stimulating couchlock