Not Ranked
I'd check the positioning of your MAF. They are senitive to air flow. You want it to be in as close as a position to stock if posible. If not in stock position make sure the airflow is travelling in the right direction or try rotating the MAF and see if it improves. At WOT the EECV goes into open loop and ignores MAF so that would explain why the engine picks up after 50% throttle.
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