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that should be a 125+ car...... You're down 100+whp easily.....
I would take it to a mechanic who likes fixing cars not selling parts... I highly doubt the stock ecu is to blame or the tuner himself. There's another issue somewhere else.
I would think that with that large of a turbo, the power would continue to build until redline because of the low boost. Maybe at upwards of 35psi it would start to taper in power.