What level do you consider 'through the roof'? Is it possible you are contaminating your test at some point? It seems odd that you get such different readings. If you are running GFO already, at close to manufacturer recommended qty and flow rate, I would suggest changing the GFO rather than adding more. If you are concerned about your DI, just run a test on your RODI water, it is easy to rule out. I would expect below ~0.20ppm PO4 coming out of RODI. If it is significantly above this, you will either need to slow the flow through the DI, or change it, but it is hard to know which without knowing how fast your flow is and without the actual results from your testing.
Dan
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