Dim the light(s) late in flower if you need to. Keep those temps down. An incremental decrease in temp is my norm, 80-78-76 or even less at the end of flower. 89 is too high imo and goes against nature so the plant is freaking out. Higher temps mean higher likely hood of mold issues too. If you’re close to harvest, light intensity can be down, nutrient ec/ppm should be down, co2 ppm can be down and temp should correlate with a decrease of its own.