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The Motorola vt-71 was manufactured without any provision for vertical blanking, hence the terrible retrace lines you observe are "stock" to the original set. There are methods to eliminating these, though, but I don't have the link handy. I'm sure someone will chime in with it.
As far as the teletext is concerned, I just simply increased the vertical size until this was offscreen. I'm not sure what you're saying about the contrast control, but I will say that on mine the effect is very strong when set to it's peak-almost pure black and white with no intermediate shades. This effect is certainly unique among my sets.
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