Genetics or deficiency?

I also used to have similar issues with my plants a few months back when I first started. It's more than likely not a genetic issue, ILGM has a decent reputation, though that doesn't make it impossible, autoflowers are stubborn when they want to be and other times they grow like a dream come true. Perhaps your problem is similar to what mine was. Due to lack of experience, I was constantly overcompensating my nutrients whenever something started to go wrong. Generally speaking, I've yet to see a photoperiod or autoflower plant *NEED* nutrients of any sort pre week 3 or so of the vegetative stage. I noticed you're growing at 5.8pH, even though you're in 1/2 soil. I also use Coco Coir + Perlite as well as 50% soil with my grows, so our grow medium is very similar, near identical. Since I was also having similar issues when I started and eventually resolved it, my advice would be to: 1) Flush out the grow medium with an excess amount of water. If you're able to do this outside or in a sink, it'll make it a lot quicker and easier. Tap water will be okay, as long your tap is around 6.4-7.3 pH. 2) Chances are the PPM (parts per million) in your soil is REALLY high, since I firmly believe your plant is suffering from the classic nutrient lock and you've been giving them nutrients. I'd suggest stopping any nutrients for at least 5 days, I'd personally just give them tap water for the time being if the soil dries up after a tap water flush. In general, I typically never give them nutes for first few weeks of their life. 3) Ensure they aren't either rootbound or suffering from root rot. I doubt this is your issue, but it could be and it's fairly easy to diagnose *if* your plant can easily popped out the pot to check. If they're bound, simply massage the roots to loosen them a tad and put the plant[s] in a larger pot for the rest of the grow. If it's root rot, there are a couple of solutions if the problem hasn't developed too far, but I would look into multiple different sources on Google if so. 4) Keep your plants on a good watering schedule, consistency is key. Every 2 -3 days, *maybe* 4 if your pot has high water retention. Under or overwatering can easily cause issues like these, among many others. Also, I noticed you mentioned in the comments that you previously flushed and the soil has been wet since. This sounds like the plant isn't absorbing much water due to nutrient lockout as previously mentioned. Correct the pH of the soil (6.4 - 7.2 would be perfect with half soil) by flushing it with tap water and I think the problem will stop. No need to change the pH of your water for the flushing process, adding pH Up or pH Down almost defeats the purpose of the flush too. You really want to rid of all the excess salts in the medium that haven't been consumed by your plant. 5) Since you're using different grow mediums in different pots, different pH ranges and requirements are necessary for each plant. Try and keep the grow medium consistent in the future. It'll make your grows a LOT more enjoyable and easy to follow. A general rule of thumb for pure coco medium is to treat is like a pure hydroponic grow (5.5 - 6.3 pH). For grows with half soil, pretty much treat it like a soil grow, with maybe .1 or .2 pH different, if even. 6) Overall, attempt to get your pH around 6.5 with this grow medium. I've noticed when I use at least 50% soil with other inert grow medium, I'm pretty much just growing in fluffier soil with better drainage. I've grown all my grows like this so far and 6.5 pH is pretty much my sweet spot for no issues. 7) Generally speaking, avoid nutrients unless the plant has developed a few large fan leaves, typically around week 2 or 3 of veg stage. Even then, go VERY light, unless the plant is just huge. Most you'll need in week 2 is typically a tad of CalMag. (for soil based grows) I hope this helps in your future grows!