It's possible that your setup drys the pots out very fast, that variable is a bit different for everyone. I'd still make sure to water until you have runoff because that will keep the Mg levels down as well by flushing mineral buildup out.
I believe that yellow spotting results from Mn deficiency, often caused by too much Mg in the soil. Autoflowers are hyper-sensitive to nutrients and in my experience Candy Cane is especially sensitive. I had to use a very soft, organic 1-1-1 soil with minimal feedings to avoid damaging the...