Thank you all for your feedback here.
I realize that the preview files are just on-the-fly/ram, but when I saw that the speed changes looked fine in this state, I thought for sure there was a way to force that output. I’ve gone into the sequence settings tabs, and tried all kinds of different selections under the “video processing” and “render” tabs, and I’ve even tried a motion blur on the clips, to no avail. I’ve also tried to cook the files into other codecs, then import them into Final Cut…no help. And, I’ve changed the codec on the sequence, even in a desperate move set it way back to DV-NTSC…just to see if the smaller size would make any difference. Nada.
The MOTION suggestion sounds great, but I don’t currently have Motion installed…I’ll check that out soon.
I think I’m just going to have to tell my poor students that they can’t change the speed of their clips (could be good for them).
But teacher gets an F for not testing slowing down footage when I tested these cameras, which is where I went wrong.
Thank you all!