Need help identifying if I've got a problem w...

I agree from below, that it is most likely strain related. I use the controversial method of leaving the lights off for 30+ hours, to tickle the plant to start the pre-flower process sooner. Some scoff at this, but my results keep me loyal. I average about 12 days for pistils to form, since I started doing this.

It looks beautiful mate, really healthy, nice size. Well fed. The stain you're growing is going she's too be purple so the flowers may look s little darker and different to what you're used to, sane with the trichomes later on 🌱👍

It takes 2 to 3 weeks for the hormone change so your plants look good right now, just were their suppose to be. When they have nice button size buds, which their almost there feed at half veg half bloom ferts their first feed. Then after that feed switch to flower nutes but dont keep feeding as high as you are right now. Luck and Cheers