startActivityForResult not working properly with launchMode singleInstance

I'd like Activities on my application's Activity stack to only have one instance. I have several screens which are ListActivities and I'd like to not go through the pain and suffering of updating the lists in a previous instance of the ListActivity when another instance of that ListActivity is changed (added to, edited, removed from, etc) (or is there an easy way to do this?).

Note: I've read that singleTop will accomplish this (though it destroys the Activity if you hit the back button), but it does not work. I have a menu and if I go to my Inbox screen, then I go to my QuickList screen, and then I go to my Inbox screen again, it creates a new Inbox Activity.

Right now, on my ListActivities, I have launchMode set to singleInstance. The problem is: If I launch another Activity using startActivityForResult, the onActivityResult handler fires right away (before the new Activity is created). When I perform the necessary action on the next screen to return the result, the onActivityResult handler does not fire.

What is going on?

Here is how I fire the new Activity:

Intent intentLaunchQuickList = new Intent(ActivityMyList.this, ActivityQuickList.class);
startActivityForResult(intentLaunchQuickList, REQUEST_QUICKLIST);

Here is how I return the result:

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    QuickListItem qlItem = m_Adapter.getItem(position);
    if (qlItem != null && qlItem.getQLId() != -1) {
        Intent data = new Intent();
        data.putExtra("ql_id", qlItem.getQLId());
        if (getParent() == null) {
            setResult(Activity.RESULT_OK, data);
        }
        else {
            getParent().setResult(Activity.RESULT_OK, data);
        }
    }
    finish();
}

Here is my onActivityResult handler:

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_QUICKLIST) {
        if (resultCode == Activity.RESULT_OK) {
            Bundle extras = data.getExtras();
            if (extras != null) {
                int id = extras.getInt("ql_id");
                if (id > 0) {
                    launchQLItemsThread(id);
                }
            }
        }
    }
}