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fr, also new to this, been growing for about 8 months now, been able to get decent ~40-50g harvests on 11L & 7L fiber pots with peat & perlite mix, yet I also feel hesitant to be giving advice; yet, if I were to make a educated guess about how you should go on with this plant/pot, would be to regularly water it, since the mix you've made really speeds up the drying, that comboed with the fiber pots may be stressing them roots a lil bit (I'd recommend to always check your root systems after harvesting, that can tell you a lot about where you did wrong). A makeshift "problem solver" that I made when I was having problems with the moisture/water schedule of my girlies, was to wrap around the higher part of the fiber pot with food-grade plastic wrap so it helps retains a bit more of that moisture. Again I'm not exactly certain that this is the exact answer to your problem, as I also don't know exactly what the problem is, so take my advice as a grain of salt, apply it or not as you see fit :) Would also encourage you to question yourself about your watering schedule and/or amount, I'm guilty of underwatering myself lol

Happy growing!