I would do the 50% water changes. This will cut it down to be 1 + level/2. The 1 is the PO4 level of your tap water divided by 2.
a tank level of 10, would go to 6
a tank level of 6, would go to 4
This would get it under control quickly. If it is raising from the Eco-Complete, that should stabilize soon. If its not the Eco, its your feeding that would cause it.
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