Could you use a dowel and hang your pasta so that gravity keeps it straight? I know that might create some issues if you have a short dehydrator, but even an initial hang might give you some extra rigidity. Your pasta does look pretty straight by the way and from the loops at the end I think you might already be hanging? Were did you find your time cycles for drying from? I know that commercial dryers have “recipes” for each type of pasta shape, was wondering if you had any access to such.