Since you have wings, you can do this, as follows: Find the Zone Manager link in the Member Links submenu. Go to the Zone Manager and click the red cross next to the Zones you want to delete off you personal shortcut list.
When you're done, click the Save button underneath the list. This step is important, because if you forget it, all your changes will be discarded.
Since the real list is longer than 250 items, but only the first 250 are shown, you will now see items after the letter P, that were previously hidden.
*) That's because this forum is for cleaning the general Release Zones list, not your personal shortcut list, since you can do that yourself. And now you know how. :-)
If you have wings, which you do, you can go under the My Shelf tab and click on "Manage Zones." Then click the red X next to the ones you don't want anymore, click on Save Shortcuts when you're done, and you'll be all tidy in no time.