Earth juice is notorious for very low acidic pH.. around 4.2. I'm also using Earth Juice, but I bubble my solution using the 3LB recipe that can be found on this forum. Basically, what you want to do is bubble the 3 Grow, Bloom, and Catalyst in a big bucket with an air pump and air stone. As you bubble it, the solution's pH will rise as the microbes are awoken and fed. Around 30 hours is prime as it brings the pH to an acceptable level. Of course, all of this pH stuff wouldn't be an issue if you added dolomite lime (about 2 tablespoons/gallon) as it acts as a buffer to stabilize the pH.
I'm on my first grow, and I'm actually having great results through researching this site and reading lots of posts about earth juice. EJ's only downfall is the low pH, but that is easily dealt with the dolomite lime.