im also using cfl's the hole time also and my plants maybe 3 inch's bigger and 3 weeks into flowering so but i have been tying down the heads for the last two weeks i think it will be done in another 3-4 weeks longer

naaa actually they are the same sizes and my master head is growing just like that but its also a hermi "1st grow" and about 5 heads growing 3 inch's shorter just like your's!!!