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Part of this is normal and depending on how it sounds it may need the HP fuel pump but don't think its going to all go away. Reason is the HP fuel pump has a mini cam lobe that engages when the direct injectors are used thus making a noise (normal). Now some systems have excessive noise coming from the HP fuel pump (which yours sounds like it might) and the repair is to replace the fuel pump (per TSB). When the port injectors activate then the noise will go away but you would never know because you will be driving when this happens ( I have ran active test on the fuel systems had have verified the noise only occurs when direct injection is on). Just go in and tell then their is a TSB for the HP fuel pump and you have the same noise.
FYI:direct injection is on at idle and that's why its noticeable.
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