Ideal RH in the UC running CO2?

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So 1k ppm is a good number to be at for flower with co2. Im in the process in dialing in my sealed room just finished my first run and I seen a huge difference with co2 . I hear a lot different opinions on co2 ppms

We noticed significant improvement @ 1,000, however we are in a very dry area and saw the benefits of the CO2 diminish at week 7 once the weather turned extremely dry (20-30% RH), just as Woodsman suggested. Not having to worry about PM is always nice though...

 

[bigdaddyg8]

What PPM, what strain, how tall/wide are your plants, which UC/lighting system, and what do you yield in dry weight?

my co2 is at 1000ppm. currently flowering , 3 Chemdog and 3 super sour og . 52inch tall 36inchs wide. 6 site 8 gal uc. 8inch air cooled raptor reflector 1000 watt hortilux bulb

 

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neat