Importing Video creates motion artifacts

After days of frustration with Final Cut Pro X (I'm a new user), I've run into a really frustrating problem I've been unable to solve on my own:
I start with an AVCHD video in m2ts format, which I then "repackage" to .mov or .mp4. Then, I import into Final Cut Pro, and since FCPX doesn't play well with this format, I use the "optimize video" option to convert to ProRes. This takes awhile, but mostly works.
The problem I'm having is that the imported video contains motion artifacts. That's really the only way I can describe them. Little squares of the video that appear in the wrong place all over the video when something on the screen is moving a lot. If there's nothing much moving, no artifacts, but then as soon as something moves, there's little squares that appear/disappear all over the video and make it look awful. I've tried converting the m2ts to .mov or mp4, then importing, but nothing I can do seems to improve it at all.
I should mention that the original m2ts plays fine, the converted mp4 or mov plays fine, but once it's imported, it's borked. I thought maybe it was just FCPX, so I exported, but the exported video still contains these artifacts, so it's clearly the import process that is breaking these videos.
Does anyone have any suggestions for me? I'm really at my wits end about this

Sorry, let me be more clear.
I'm capturing video from a tuner card from my XBOX 360 in 720p at 60fps. The resulting video is an m2ts file which cannot be imported into FCPX. The app I use to capture has a function to convert to mp4, but I believe it's just repackaging from m2ts to .mp4, because it only takes a second or two to perform. Also, I use another application which losslessly converts to .mov. This also only takes a few seconds which means I'm pretty sure it's just the container changing, not the video format itself.
If I import this video as-is, without converting it to prores with "optimize video", the clip doesn't render, and there are green frames all over it, and sometimes it causes FCPX to crash outright. After doing a lot of research, this is a well-known problem as this video format is apparently "frameless" or something (I honestly can't remember what it's called). Anyway, it makes editing impossible. I know if I was using a camera I could use the import from camera feature, but because it's a tv tuner, I can't do that.
I've tried every playback format I can think of. Full screen, high quality, better performance etc, it's all the same. Also as I mentioned, even when I export it, watch it in VLC or quicktime it has the same artifacts.
EDIT: I should also mention that I'm at work, but I can post an example when I get home if that's required. I was hoping someone knew what I was talking about, but I can get an example too.
Thanks
Jeff

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