I'm no expert thats for sure lol but i highly doubt its a build up in the soil as you've been giving a small amount
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Just to be precise regarding the flush, you always want to flush and then water with slight feed.
Your plant shows classic Mg def symptoms. Autoflowers consume large amounts of both Mg and Ca, more than photoperiod strains. If you are using RO or distilled water, then need for Ca/Mg supplementation rises even more. If you are using LED lights, the need for Ca/Mg sup increases. You need to get a Ca/Mg supplement such as CaliMagic or many other selections. Try to get one that has a low amount of N in it, like 1 or 0 percent. Some are as high as 5 percent N, stay away from those. I use AN nutes and mix according to ppm. At 30 some days old, I mix about 500-600 ppm. You will be surprised how high ppm you are mixing when you just follow the 1/2 of the recommended ml/L. Test it some time if you have a ppm meter, sure surprised me.
Do you feed enough so 10-15 percent of what you pour in the top, comes out the bottom? By doing this, you wash out some of the salts as you go.
I'm doing a coir perlite grow for the 1st time and really stunted my plants by giving them half dose nutes cause i read several places that autos need less than photos. well it isn't so for these girls! I'm going full nutes now and things are much better. 3 weeks ago my plants looked a lot like yours. like was said tho. bring em' up slowly so they can adjust. too quick you can mess them up worse!
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