I only have grown outdoor, I belive they will never be rock hard buds. Because outdoors not everyday is a full sun day. How ever the buds do get big, very full of tricromes, very potent. I found the more direct sunlight the better, and got to have more water. I love my outdoor homegrown. Plant training helps me to get more big coals.
On a different note, if your buds are to fluffy to smoke, could make some edibles. I have made some super potent weed butter with sugar leaves and larfy buds.