Your plants are yellowing from the bottom up. You need more nitrogen. People with smaller bottles may have more nutrient rich mediums to sustain the larger plants in smaller pots.
There is little you could do besides repot once plants become root bound. You can feed with 1/4-1/2 strength nutes and see if that helps.
What is your soil mix? If you keep it very light and fluffy with lots of perlite and coco the plants roots will grow faster and have more room in the pot then heavy compacted soil. The draw back of this is inert ingredients like coco and perlite will mean your pot runs out of nutrients faster meaning you must feed earlier and more often.
Quite a few people on the board are using clear bottles to flower with great results. Light proofing your bottles shouldn't hurt but let one go with clear sides and see for yourself.