I definitely feel like ive overdone it because ive managed to use almost all 250ml calmag including the buffer on about 100 litres of Canna coco, i used coco A quite alot to and probably strengthened the buffer to much at the start and fed them from the start, and thats fairly high from what i can see, i never realised i was to use a&b together through veg and flower as you can tell im still very much learning but think this is the only thing slowing me down now, i will try and get Hold of the Calmag you mentioned, that was my next thought a lower n content so thanks for that, appreciated.
I read something that said its always usually a mg deficiency rather than the calcium so maybe try epsom salt, might give that a try at some point, clearly have over done it, rookie mistake.