Splotches on leaves

I see you have pH fluctuating in your diary comment, so you have to get that steady first. If things were fine before, this will likely correct the issue. ensure a proper wet-dry cycle. only irrigate when top 1" is dry and pot is light. As you ramp up to full strength and soil is depeleted, ensure 20% runoff when you fertilize. When you add water only, pH it to 6.8 or slightly acidic. Do ensure full saturation. Dry pockets will wreak havoc on pH and nute levels, as well as kill off useful microbes (the cause of the pH thing).