they look starved. When the leaves start yellowing and dying throughout the plant it means it is using up all the remaining Nitrogen. Because the buds look unhealthy it's likely your plants got starved of nitrogen and or too much heat/humidity through the grow as indicated by fan leaves curling up and "canoeing".
Since they are at this stage, just flush the plants with properly PH'd water, adjust heat/humidity to about 77F and 40% humidity and leave em for a week.