How to letterbox the screen and have pixel perfection in a 2d game

Hey everyone, had a question about the orthographic camera and how to make it pixel perfection and to also lettebox or maintain a consistent screen size at the same time

see i can do each of these individually, to make the screen pixel perfect i set the pixels per units of my sprites to 32, make sure the sprite sheet is a power of two and use the following script

Camera.main.orthographicSize = Screen.height / 32.0f/ 2.0f;

this makes the sprites look crystal clear no matter what resolution is used as the camera is always a fixed size, however on lower resolutions it cuts the edge's of the screen off

on the other hand i have this script i came across which makes the screen always maintain a consistent aspect ratio

http://wiki.unity3d.com/index.php?title=AspectRatioEnforcer

however if you use this with the pixel perfect script i mentioned it alters the screen size to letterbox it as mentioned but also makes the sprites appear jagged and flickering at certain resolutions

so how on earth do i combine the two, since both of them seem to affect the camera in some way how do i make my orthographic camera maintain a consistent size but also fit the screen at different resolutions to stop the edges being cut off, thoughts?