Orange Sherbet

Really struggling to understand where this is going wrong, unless my PH meter is just way off. Think the coco not being prepped at the start with calmag hasnt helped things and has been a bit od a chasing game ever since. (Kind of messing up the balance of nutrients as have been feeding much higher calmag) Been following the schedule and checking EC each day. All seems fine but would appreciate somebody looking to see if they have an idea? Have been feeding 1ml/l until mid week, noticed I could be locking potassium out using such a high EC of calmag at this stage of flowering. Realised I am seeing so many different deficiencies, some look like potassium, some magnesium and some are beginning to yellow at the tips of leaves and work their way back to the base of leaf. I did post a question about this but havent heard back yet and my research hasnt gotten me to far. Decided best thing to do is flush and restart but using half strength calmag at 0.5ml/l and pushing on the schedule a week to add more bloom. Very tricky having to guess with this as the BioBizz schedule is meant for photoperiods so just following the same ratios but unable to keep exactly to schedule. End of week runoff EC IN 1.41 EC OUT 0.358 (very low after flushing 20l and adding 4l nutrient mix, maybe should have used more to bring ec up to same as input?) PH IN 5.8 PH OUT 5.7 Thanks for checking out my diary and wish you all the best on your grows! 🙏👍