Acapulco Goldzilla

Hi grow mates. Acapulco Goldzilla is starting week 22 on day 21 of the flowering stage. I was away for 2 weeks on holiday, and left her on timed drip of about 2 gallons water (neutral ph) daily. A few days ago, I fed her 1/4 cup of the dry flower fertilizer after soaking her first, then watering again after. I also give her an extra 2 gallons of water mid-day on some days. This week, I defoliated pretty heavily some of the sun leaves to give more air flow into the interior. She has grown into a 5 ft. beauty with 18 main lines. Each of those mainlines has 2-3 additional lines as shown in the pictures. I am a bit concerned about some of the yellowing fan leaves. In some cases, they just fall right off. Not sure if this is normal. If anyone has suggestion on where to start my research, let me know. I previously tried liquid nutrients, but ended up never getting it right. So, I switched to dry for simplicity. I did follow a tip from FastBuds (https://2fast4buds.com/news/best-feeding-schedule-for-autoflowering-plants) to blend my dry nutrients with 75/25 and 25/75 ratios of grow and bloom fertilizers, and I typically feed every two weeks.