I would wait on the flush. I tend to think you will be closer to 3.5-4 weeks till harvest. Most strains take 8 weeks with 9 or 10 being very common. Some sativas can take 13-15 weeks and there are strains that can be finished in less than 8 weeks, but I would count on a minimum of 8 weeks and probably closer to 10 before your harvest. Keep an eye on those trichomes and harvest when you have the right mix of cloudy to amber for your taste.