Loss of quality when flipping and speeding up video

Hi,
I have Adobe Premiere Elements 12. I’m running it on Windows 7, Intel 2.5Ghz, 6GB RAM. The input video is shot on a Sony DSLR, AVCHD/MPEG, 25 fps, 1920x1080.
I am trying to video myself drawing and then speed it up. However there is a significant loss of quality after I’ve done a vertical flip, horizontal flip and sped up the video. The video appears grainy and jittery. I’ve tried a number of combinations. When I make no changes to the video then the output is fine. The main loss of quality seems to come when I do the horizontal and vertical flip.
Any tips on how to reduce the loss of quality or where to read to learn about this would be greatly appreciated.
Thanks,
Laurie

Thank you for your speedy response. I am new to the program and it is hard to take on faith after I work on an 80 plus image sequence that they render out ok, since the display in thew viewer is so poor. I did render it out to QT, and yes, the animations play cleanly.
However there is a secondary problem. Still photos are crisp and clear, however any photos with motion keyframes become soft. At first I thought it was only a problem with my .psd sequences, but the problem persists with non layered image files as well. I come from a photo background, and I know not to expect the resolution from a print, but the poor image quality/bluriness/softness of my keyframed images is noticeable to non-photo types as well.
Thank you again.

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