Rusty spots on fan leaves.

She is currently in SS (not as good as it could be) on day 30. These spots started showing up about 5 days ago and I thought it might be Cal/mag. She just got over being slightly Phosphorous deficient about 3 days ago, then this started showing up. I gave her a fairly strong does of epsom salt and top feed with some steamed bone meal. could it just be Calcium? I know the bone mean may take a bit to break down and I dont want to add more and have her get burnt. Any help would be greatly appreciated.
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Appears to be cal/mag, what's your ph at?

6.5 She had got a few feedings where the Ph was out of range. 7.5+ but that was weeks ago.

I think its cal mag def and or iron def too, if you are in supersoil, I would simply ride her out without doing anything else than cal-mag for the next few watering.

I left out dolomite lime and Azomite when I mixed this batch of SS (first time at any of this) Definitely regretting that now. Hopefully the bonemeal will give it enough Calcium to take it another month.