Still having trouble telling whether it's a deficiency or an excess of nutes, advice opinions greatly appreciated

In my opinion, your plant seems to be suffering from too much nitrogen. Give your plant plain water for a few days, before resuming feeding. Either feed less (half strength) or feed less frequently (every third watering) and all should be good. Your plant is not huge, so does not require a huge amount of feeding. Now that she is flowering, she needs less nitrogen than when in growth/veg phase and now needs more phosphorous and potassium to help the flowers grow. Hope this helps.