I thought if you just take off the air intake bits up to the turbo, that you're able to access them? One youtube video shows with a long enough screwdriver, you can access at least one of the hose clamps to tighten. I did this and it made maybe a small difference.
Have the same problem where I drive to work so haven't gotten around to tackling this. I will just do the air intake bits first just as a test. Definitely don't want to take the manifold off.