iPad custom size of modal view controller

I have a couple of modal view controllers of certain size. I'm trying to avoid the use of custom views (creating full screen black translucent overlay over current view, add the modal view over that view, do the animations, etc) to present it because there is no modalPresentationStyle that fits the size of my controllers.

Now I'm using UIModalPresentationPageSheet but my view is smaller in height and I have an ugly blank space

Desired presentation

 _______________
|    _______    |
|   |       |   |
|   |  MyVC |   |
|   |       |   |
|    -------    |
 --------------- 

Actual presentation

 _______________
|   |       |   |
|   |  MyVC |   |
|   |       |   |
|   |-------|   |
|   | blank |   |
 ---------------    

If I use the UIModalPresentationFormSheet the container is smaller in width.

I'm trying to figure out how to do it but I don't know if it's possible. What is the solution to the problem of presenting a modal VC smaller than any of the presentationStyles? The only solution is to arrange a "custom modal view controller engine"? Popovers doesn't fit my design requirements :(

As some other users here, I also had the problem that the origin of the modal view controller was not correct. After some experiments, I found a solution that worked for me:

- (void)viewWillLayoutSubviews{
    [super viewWillLayoutSubviews];   
    self.view.superview.bounds = CGRectMake(0, 0, <width>, <height>);
}

I obtained the following result (link text) by using:

self.modalPresentationStyle = UIModalPresentationFormSheet;

and by presenting it as a modal view controller. Let me know if you need further help.