My Text gets blurry with Pixel Perfect Camera and Upscale Render Textrures Active

Hello im Using the Pixel Perfect camera in Unity and i try to have a text in my canvas but if I hit play my text gets blurry. I tried with Text Mesh Pro and Normal Text result is the same. And if I tick my canvas with pixel perfect there is no difference. If I don't use Upscale Render Texture the text don't gets blurry but I want to have this option active.

Before Playing: While Playing:

Here are my Pixel Perfect Settings: Assets Per unit 32 Reference Resolution 640x360 Upscale Render Texture true Cop Frame X false Y false

It would be nice if some one can help me out.