you'll be fine most likely.....you're still really early into flowering so your plants will still
grow a little more in height....since you have a lot of time left till harvest they'll recover and continue to bud.

I'd say the slow growth is from lack of light.....even if that's not what's causing the slow growth you still need more light on those....you can buy a cheap socket splitter....its basically a hard plastic Y that splits the socket into 2 therefore you could have 4 lights running in that space.....they cost about 3bucks.

yes the type of growth speed in flowering varies from strain to strain

yes those are both very much female