Let it go one more week brother man! When ever you question if she's ready I say give her another week! Those leaves still have plenty of nutrients for those flowers.
Are you talking about the tips looking a little burnt/brown? That is generally from to strong of nutrients. It could be from the past, as it will not go away. The leaves in the background are a little blurry, but also look they could have been burnt and/or maybe a little lockout from your PH being off.
Pistils are only a portion of determining ripeness. Your pistils should be receded into the swollen calyx and the trics should be milky in color (helps to have a jewelers loupe to see, or a 40-60x magnification )