Zink or iron deficiency ???

Don't know which one I have !! Need help..

My soil is pH of 4 I know it is low but at the start of my grow I asked about it then and was told it was OK as there are buffers in the soil. But guess it's not OK after all is there a quick way to bring my soil pH up dolomatic lime takes months

Adjust nutrient solution with some PH Up Potassium Hydroxide, Just don't use dangerous and caustic sodium Hydroxide to raise PH (Golden Grow, if they still have it available) they also have PH down Nitric Acid and citric acid vinegar.
PH is above 7 or below 5.5 Nutrients are not absorbed very fast and can cause problems.