Photoshop to FCP works perfectly for me. I tend to create a workspace the size of my project (ie 1920×1080) and then place my text accordingly. I find that .png files carry transparency to FCP very well.
I’ve finished several broadcast shows like this with no issues. As Michael said, you cannot judge your project from the canvas window. You need an external reference. Watching the canvas for quality will just have you pulling out your hair.