Did you try truing your wheels after the crash? From the sounds of it, some of the spokes where bent from impact. This could cause them to pull with more tension than others causing the wheel to go out of true.
Most of the time, it's the rim that has a permanent bend that forces you to use very uneven tension to true. In this case, it's an unfixable taco and the rim needs to be replaced. After unlacing the rim, if you place it on a glass coffee table, you can see the taco shape.
In your case, if the rim's perfectly straight, I don't see why you can't reuse it. It sounds like some of the spokes got tweaked, and maybe some of the nipples were stripped, leading to uneven tension.