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Hi
Is the PO4 test kit API? It is a good product, unlike their GH and NO3 tests. Anyway, the PO4 kit says wait 3 minutes. So anything longer doesn’t matter. You say you have between 5 and 10 ppm PO4. That is very high, keep changing water until it drops. But no lower than what you feel comfortable reading on the colour chart. With this particular test kit, 0.5 and 1.0 ppm are good colours to use as the base. Anything lower or higher can be easily distinguished.

Tip, if you use 2.5 ml and 3 drops of both reagents you get the same readings and double the number of tests.

And I would not use the Seachem Iron because the Seachem Flourish Comprehensive has enough Iron as is. Also, the Mg level in the Salty Shrimp is still unclear.
 
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