I'm a bit confused as to why there would be a pixel aspect issue. I made sure that the sequence size in Premiere is 960 x 720 and the pixel aspect is set to 1.5.
The problem I am running into is that once I've selected a preset in Premiere, it doesn't really let me alter the settings. So I can't change the pixel aspect, or the resolution.
You'll have to excuse my ignorance, I'm fairly new at editing.