Any suggestions would be greatly appreciated!

Whatever you do, do not grow 24/0, it is totally un-natural and not healthy at all. All plants NEED sleep to finish their photosynthesis cycle and to have a correctly functioning metabolism. A plant with an incorrectly functioning metablolism will never grow to its best potential. 24/0 could only be recommended by people who don't understand photosynthesis or understand how plants function either. The myth that it is ok to grow at 24/0 needs to be removed from the world! Besides, cannabis can only grow so much during any one 24 hour period and this growth tops out at around the 18 hour mark, meaning running your lights any longer than 18 hours is basically a waste of electriicity. 18/6 has been derived at through 90+ years of cannabis research and is not a random number, it is recommended for a reason. Cannabis needs to be nurtured and cherished, not pushed to within an inch of its life like a machine to produce "product". Grow with love and kindness and your plants will reward you with lovely kind buds full of goodness! Hope this helps, Organoman.

increasing from 18 to 24 without understanding what you already provide may or may not help the plant. relative to environmental conditions, there's a max amount of photons per 24 hour cycle the plant can handle (DLI allows apples to apples comparison, but still relative to temp, rh, atmospheric co2). If you provide it over 18 or 24 makes little difference.. in fact, some hours of darkness are a good chance to be a positive, too. The only time increasing from 18 to 24 will help is if your light is a little underpowered. this will provide 33% more photons per day (assuming all other factors remain the same). you can squeeze out an extra 8 percent by using a 13/11 schedule in bloom. This is perfectly safe to use. 14/10 is where you might find some hit or miss effects on a photoperiod. But, if were already providing 'max' dli not all lights come with accurate specifications, but when they do it helps get you in a small range for fine adjustents in this regard. if it doesn't stunt the plants, and no other symptoms, it's probably okay, because it's not going over that 'max' DLI. can google for references of estimated dli for ambient co2 vs maintaining 1200-1300ppm co2 into area. still have to observe and react to fine tune it, but between the math and what the plant says, you can get to a more optimal place much faster.