If you can hear the turbo
at all then there is a problem. You should not be able to hear the turbo over the engine noise. Usually the seals on the U-tube from the air filter are not sealing.
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I suspect I may have over tightened it which does not allow the turbo enough play to spin up properly
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The torque only holds the nut on the shaft, it does not alter clearance.
8psi is 100% normal if you didn't touch the wastegate, its what these cars came from the factory set at.
I'd start by checking the u-tube seals then for air leaks between the compressor outlet and intake manifold. If you don't find anything then take the turbo back apart and start again.