Hard, Brown, Deformed Buds

I\'m getting hard, deformed, brown buds on all of the lower branches. Only the tops are okay. What is wrong with my plants?
Lime Kush/Trainwreck hybrids
Veg: 5 weeks - Ebb and flow
Flowering: 6 weeks - Nutrient Film Technique
Indoor
Hydro
30 gallon reservoir
65 degrees water temp
Rockwool
Compact Flourescent - Veg
1200W HPS - Flowering (cooled)
Room Temp: 85 degrees
Ph - 5.8
Relative Humidity: 50%
No pests
No mold
Watering 1xday VEG
Watering every 30 minutes FLOWERING
Ionic Grow for VEG: 600 ml for 40 gal res
House and Garden for FLOWERING at recommended levels
Room size: 100sq ft.
Adding Cal-Mag at 5ml/gal both veg/flowering.
Well water treated with ozone to kill diatom algae.
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