Critical O P grow

Ok so another frustrating week! So this week I re potted her and moved her into "the big house" under new lights (GN Telos 0010) set at 70cm from canopy and perfect environment controlled by temp and humidity equipment. Now because of the cal mag deficiency I buffered the coco 2 times in an 8 hour soak in 150% calmag solution ph'd to 6.1 prior to transfer. Then after draining and getting to the correct temp I moved her to the new pot and topped with a light A+B feed. A day later I fed with the nutrients listed which includes 1ml/L of calmag and again the same the following day. Run off ph is spot on at 6.2-6.4ph, although it was 6.6 when I checked today and growth is great but this damn limegreen cal mag deficiency seems to be continuing. At this point I am hoping it's damage already done that didn't show when the leaves were young. The bottom leaves dont seem to be getting worse and some of the reddening on the stems has gone so fingers crossed this next week will see a change in green because I'm out of ideas, apart from making a foliar mix and trying that I'm stumped! The only thing I can think of is a flush incase of a nutrient lock out but I cant see that being the case as her nutes have been light. Even now with all the nutes she is getting the EC is only at 1.4. Thanks for reading, any comments/tips welcome as always. Happy growing!