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I would think that the second diagram (diode across R409, cap from point 89 to ground, R407 bypassed) should work. Added cap should be should be 4.7 uF, not 0.1, I think. Try reducing value of R409. If DC restoration is working, but you go too small on R409, you will see some shading from left to right in the picture. Current value of 470k makes discharge time constant with C403 of about 1/20 of a second, does not have to be that long. 47k would be more reasonable and should give about 1% tilt.
Last illustration (resistor in series with diode) definitely will not work, it slows down the charging of C403 on sync tips. The goal is to charge very quickly, then discharge relatively slowly until the next sync pulse.
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