I don't run soil anymore and when I did, I wasn't a proponent of checking my soil pH, only my water inputs.
I read up on Earth Juice and what I find odd is that in one sentence they tell you not to worry about your pH (don't worry about this highly acidic feed you're about to pour into your plants 'every time' you water, "Earth Juice will self-adjust as it breaks down in the medium"....self regulate itself as it breaks down over time...huh?), BUT if you are worried, here's a 7 step process you can follow to adjust the pH yourself.
At this point run...just run! Either it has to be adjusted or it doesn't.
And if the pH does adjust as it 'breaks down' in your medium, how long does the 'breaking down' process take and if it takes, let's just say 5 days to break down or 'adjust', and you're feeding every 3 or 4 days, what's happening to the ever stacking feeds you'll end up giving it...in other words the 'breaking down' process wouldn't have to time to occur from feed to feed before you dumped more acidic water into your medium.
I hate to beat a dead horse...pH.