Jimmy: Rather than filming off a wall, you might have better luck projecting onto a bright white piece of foam core mounting board, either the typical full sheet size (20x30) or half that (15x20). The smaller image will be much brighter, reducing any effects of the "screen" or ambient light spill, and if you have something to hold it in position separate from the table holding the projector you cam adjust the whole projector/screen/camera relationships for the most pleasing results. I used to do this with 16mm footage shot by my students with a setup in my basement, where I could create total darkness. The closest you can get to that helps, of course. Anyway, the results I got were surprisingly good, though at the time I was using a 5-blade projector and an NTSC (SD) camcorder. Later, I created an HD version, using a standard Pageant projector and a Canon XH-A1 camcorder. The results of that were clean enough to submit successfully to film festivals.
The NLE we were using during this period was the pre-X version of FCP, and I always found its speed change results just fine. I don't know how well current softwares do this, but you might check other web forums to find one that both does well and you have access to.
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