> The only answer I have at this point is to update some of these lens for newer lens.
You run the risk - significant, in my opinion - that your updated versions will be exactly the same way or worse. All of your lenses are fully compatible, and all others that you might get would be built to the same specifications and tolerances.
I think you have no problem at all. But I'd say that if you have a problem, it's the D90 and not any of the lenses.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!