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You can check your O2 sensor is working by unplugging it and see if there is a difference in the drive. But ECU has an error code for lambda not working so you should have seen it.
You might want to check what the ECU can do. I know for the CA the 44Fxx ECU does not have built in lambda control circuit, whereas 39Fxx does. You might have a similar problem.
Otherwise check for boost leak. But if it is going to 9psi it might not be that. Try cleaning your MAF too, that could help.
Not very suprised about boost going to 9psi if weather is cold, and/or if you installed a freeflowing exhaust / intake.
you could check the temp sensor too. If it is defective, the ECU will always command more gas. I dont have the values in mind, check the service manual for temp/ohm value .
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