Hairs turning brown too soon

russets work from bottom up. Check the undersides of your developing buds, especially the ones you suspect with the problems, and see if there is any brown discoloration on base of the buds. If you notice the bottoms of any flowers have brownish tinge to the calyxs then it is likely russets.
Your pics dont show any obvious russet symptoms like leaf curl, etc...I do see what might be thrip damage on your fan leaves.
 
If it is Russets ( and I'm not convinced by the pictures it is) it's not over.
You're early enough in flower to get in a few early morning or evening sprays. Nuke Em or Green Cleaner are safe.
 
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