First non-Ghetto Grow, Looking For Some Advice/opinions

Hey fellow growers, I've had 4 grows done prior to this but this is my first grow with what I'd like to consider real equipment. All my grows prior to this was done without ventilation, flowering nutrients nor "decent" soil.
 
Anyways to the point I'm currently growing two females, whom both is in flowering. I have a 1.2x1.2x2m tent which they're situated in. Running with 250W HPS, I have a outtake fan which pushes about 180m3/h out of the tent and a passive intake. I also have another fan which circulates air inside the tent. I'm just running it at slowest speed and have it blow a slight breeze on the plants. My concern is with my one female plant (Pineapple Chunk by Barney's Farm), in vegging it had a harder time than the other plant at growing and was pretty behind, I topped my other plant (Trainwreck by Royal Dutch Genetics) to kinda try and let it catch up. I've had 12/12 lights running for a while now, I don't have any specific date since I didn't write it down which I prolly should have done... So I actually have no clue precisely when they went into flowering, although I got a feeling that it's atleast 6 weeks ago and maybe up to 8 weeks ago i switched to flowering. My concern is that Pineapple Chunk doesn't seem to grow that well compared to Trainwreck in terms of bud development, it has hardly started its buds and the leaves seem somehow sad? however It has grown in height noticably, it's taller than trainwreck is now.
 
Here's 2 pictures of it, apologies for the bad quality.

 

 
Now compare it to trainwreck:
 

 

 
 
 
They both switched to 12/12 at same time although pineapple chunk took a little bit longer, maybe a week or two to start flowering. But I'm still thinking to myself, shouldn't it have grown a bit more? My other plants definitely did that.
 
Another thing I find interesting about the plant is one of its characteristics. A few of its shoots to the side have by themself split open and gone out into two shoots instead? It doesn't happen consistenly but I've seen it 3 places on the plant.
 
Example:

 
She tends to be less thirsty than trainwreck aswell, both were fed sensi grow a+b for vegging and are being fed bio bloom for flowering, I don't follow a schedule as of this grow since I wanted to do one without. Both are planted in Canna Terra Professional soil, trainwreck was transplanted in it aswell, Pineapple was transplanted with Canna Coco soil. Both transplanted into 18L pots 30.5x30.5x30cm(ish).
 
Is there any advice/tips on how to improve pineapple chunks situation? Or should I just give her time. Also i'm trying to figure out how far trainwreck is in flowering, any ideas?
Also any other constructive criticism is more than welcome! I'm only looking to improve.

 

 
Now that you're mentioning it, actually I've had two "light leaks" both my mistake, opening the tent while its dark. One happen in start of flowering and the other happend not too long ago, maybe a week at max. However I quickly closed it off again both times realizing what I'd done. I'm pretty sure I don't have any actual light leaks in the tent although I just went and sealed them even further just for the sake of it. I'll check and confirm there's no light leaks once light goes on.
 
I dont really understand how I can be over watering her, I mean I'm watering Trainwreck a lot more compared to her. She might get water once a week versus Trainwreck getting each second day? Does Trainwreck just need a lot more water since it's buds have started thickening? I only water them when they show signs of needing it (leaves hanging).
 
Appreciate the help

 

 
Interesting, well yeah I dont mind waiting it out, I'll just give her the time she needs to get some nice buds. I've only heard good of the strain personally, and yeah I get what you mean by growing the same strain would make stuff easier, it's definitely something I'm gonna do in the future. However right now I kinda like exploring the different strains, my personal favorite I've grown was Vanilla Kush from same seed brand as Pineapple Chunk hence why I decided to give it a try. Once I've actually pinned down the type I like I'm definitely gonna plant more of that said strain. I originally had 3 plants in the tent, an autoflower aswell but it's harvested.
 
Appreciate the advice

 

 
Hmm, well I do have the light quite close to the buds... Might be on to something. I keep the light about 5-7cm above the tops? With air breeze blowing at it trying to move the warm air away.
 
I don't have anything to measure the ph value of my feed although the water I use is between 6-6.5ph, which should be alright? Im not sure about the biobloom what type of ph it has. The nutes i used for vegging use a "ph perfect technology" or atleast so they market it.
I try to feed mainly water and then include some nutes maybe once a week, 2-3ml is what I usually mix with 1L of water (approximately, i measure using a spoon, lol.)