Does the client notice the judder?
… with interlacing, there’s one way to do it right (no scaling, correct field order, proper frame size, proper frame rate) and, I suppose, four ways to do it wrong:
-scale after interlacing (get lines of varying thickness)
– wrong field order (test in AE by opt-clicking in Proj window, then viewing with PageDn key — shouldn’t jump back & forth)
– wrong frame size (should be 720×486 non-square PAR, 1020×1080, square PAR)
– wrong frame rate (should be 29.97 for NTSC)
If they look obviously interlaced to you, maybe you just have a really good eye. 🙂 Or maybe you’re not viewing it on an interlaced monitor? The latter would show a freeze-frame as a flicker, while a computer monitor would show it as “comb” lines (in AE, you’d only see them if you didn’t separate fields on import).
Does that help?