I Think ive narrowed it down to mold or PH problems

I have a plant 5 weeks into flower and over 4 days i started noticing dark brown almost black dots on my leaves...they seem to be on all leaves except the little single ones around my bud sites( i found that odd)...although they are on the top side on the leaf there almost impossible to see unless you look at the underside of the leaf with a light illuminating the top side....theres no bugs (that i can see at least)...i thought it was the nutes but i watered 3 times with straight water and no improvement yet...i will admit i chech my PH with the little soil PH kit with the little case the the poweder you mix in with the water and judge by the color shit(heard it wasnt that accurate)...but according to that its 6.3-6.8....and my NSR Green Leaves Bloom juice has a built in PH meter (the liquid chages color based on PH when mixed with water) and it maintiains a 6.5 -6.8 average as well...any ideas???

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Whats the humidity at with lights on and then with lights off.

lights off it usually hits 40-50...on its 20-30%

This is what the leaves look like

bump.......

this is the plant the leaf is off of..doesnt seem too unhealthy (4 weeks into bud)

bump...
nobody?

Check out the pics on Ganja Guerrilla's Hall of Marijuana Plant Abuse
If the spots resume those then it could be a potassium deficiency. If so then whats causing that is something you will have to investigate.

If its just a deficiency in the nutes youre using, just feed with fertilizers high in potassium. If you are already feeding it with flowering fertilizer that is high in potassium then it could either be the pH or even over feeding. Too much potassium can have the same affects as not enough caused by a lockout effect.

Hard to say till you can identify the problem from those pictures on the Ganja Guerilla site.