Cool bout the same as mine and after you add nutes etc, what is it then??
What im gettin at bro is something is causing lock-out... pH is to be suspected the values you should be looking for are 6.8 to 6.2.. either water in or out of your pot should be around those numbers...
For instance i water my plants @ 6.6 my run-off is generally 6.3-6.4 and to be honest the only time i check is if i add something different... otherwise its always around those numbers...
Mate one more thing.... Why are you so desperate to get your RH up???.
Your only days behind me right??... I'd luv to have low RH at the stage my girls are at now, the lower the RH in flower the more resin production occurs... Tell me bro whats your thinking behind having it high.??