5's are way too low. Try using some dolimite mulched into your soil about 4 inches deep, or some fine granulated lime powder mixed with water and poured from top through bottom of soil. Lime and doloimite are ph nuetral and should bring you to around 6.5 ph, in the 5's and you are nothing but acidic. 6.3 to 6.8 is your goal. I have been using Dr. Earth's organic 5 and it has done well for a fertilizer. I believe it settles at about 6.5 for ph so it levels out the soil just fine. It sits at 7N which is great for veg and flower.

-laphter