Hey Spider. There definitely could be some nute burn on those. It's also possible for it to be humidity, heat, magnesium deficiency, or the effects of the late flower nitrogen deficiency. Either way, with as many milky trichomes as you have on those buds, it's time to flush with plain water and get ready for harvest in a couple weeks. I STRONGLY recommend you do not add any more nutrients at this point. Time to focus on getting the best quality smoke possible. If you add more nutrients then you're pushing your harvest out a few days to a week. If those trichomes ripen and turn amber before you're ready to flush because you pushed it back, you're going to end up with a whole bunch of sleeping medicine with much thc content.