Ignore the “9-11week strain”. You have a different grow environment then the breeder did. Your plant 100% has 4+ weeks left. The stigma are all still completely white which means the plant is still actively growing new bud for you. AFTER they turn reddish and shrink THEN the bracts will swell. Yours have not awoken yet they are just growing. The swell takes 1-3 weeks. During that time the plant will significantly increase in density and weight. It will also ripen which means AFTeR the swell is when you should be checking trichomes to decide your finish time.
If you are going to flush you would want to wait until during or after the swell to do that. Personally after 15 years of growing and doing multiple side by sides I don’t flush, it doesn’t do anything for the plant.