Hi my friend ...do u have pics of others that are in the same grow that have pistils? Reason for asking is my autos were over due (showing no signs of flip,pistils) so I went through my whole set up bit by bit and finally realised that my timers were not all working so my poor little ladies were having no rest from light at all , I switched to 24hrs of darkness after sorting out my light problem and whoop all my plants and the later 1's I planted which luckily were also ready to flip all flipped at once .. and this was noticeable within 1to 2 days of the darkness 😁💥!! Now I have monsters and a lot of hard work in front of me but still well worth going through the whole set up from water feed lights everything !!good luck my friend take a look at my 1st and my other set which I planted a number of weeks later to see how I was puzzled becos everything looked good and then it turned out to be something so simple happy smoking and best of luck to u 😀🍁