PP shiskaberry coco first grow

New week and its starting to look vigorous! DAY 25: Re-pot again. . . . . need more air to the roots. - She looks pretty healthy but i think im seeing some nutrient deficiency. Probably root blockage which complicates feeding. That also may be the reason why first weeks felt delayed. DAY 26: Maybe nitrogen or iron OR magnesium deficiency? I adjust pH levels before every watering, because the pH keeps rising all the way up to 7,5 which is our tap water level. Is it possible that pH keeps rising in substrate during the day and causes problems? What im seeing is: - Alot increased purple color on stems - Lower part yellowing - Overall slightly lighter green color This week she seemed to grow well, but i think root problems still exist on some level. Upped nutes to: calmag 1ml/l grow 2ml/l Thank you for reading and please share your thoughts, all tips are more than welcome.