[Marlon]

You should try and supersampling the video. Add a Video Bus Track and add a video super sampling envelope, then where the slow mo occurs within the project you just bump the envelope up to 4, 6 or 8 dependent on how long your willing to wait for the render to complete. Higher the super sample, longer render times. If that doesnt help, try change project settings to progressive scan and render as prograssive scan. This will reduce the jagged edges.