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You scoped the vertical blanker's base, which I assume is the input. What's important is what gets through to the output. It's very likely that the ringing on the base is clipped flat at the output and is not causing your problem, but you have to scope the blanker output to find out.
I also agree that it looks like you are sweeping too fast (horizontal rate) and with too much gain to see the whole waveform peak to peak at vertical rate.
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