Gauge may be over reading at 1.5.
I'd expect a standard turbo to be mapped to around 1.4/1.45.
3rd should be close to 4th/5th and is controlled by max and min boost control solenoid %.
But saying that, if you are feeling surging it sounds like a fuelling/air leak.
Common places to get a large enough leak post MAF are the turbo inlet hose split/mounting and under the intercooler. Either the hose connections or split intercooler flanges.
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