BAP. Dude. WTF. Your regulator PSI has VERY little to do with your nute needs. Your PPM in the ROOM determines them- PARTIALLY. If you have a leaky room or a big exhaust or a lot of space, you can empty a whole fucking cylinder in there and it will jsut go out the window and you might as well leave your nutes the same lol.

In ALL cases your buds are 'breathing faster'. That's the point of CO2. You have to make sure you have enough light, food, and water to keep up with it, and you can also increase your temps slightly- running around 85'D/75'N is fine.

When you set up your system, calculate your room volume and how fast you need to leak CO2 to keep it at the ppm you desire- 1100 is a number you see tossed about often. Whatever you choose, get it stable, and start working your nutes and temps up gradually until you see signs of stress or burn, and then back off about 10%. Record those figures. Every strain is different, so be flexible.