[old_tv_nut]

Regarding the horizontal wiggles, two things could contribute:
1) Your color bar generator probably has a simple vertical sync pulse with no serrations; that interrupts the horizontal sync. This causes the horizontal AFC detector to output an erroneous voltage during V sync; then it has to recover.
2) The R and/or C values in the horizontal AFC filter circuit (between the detector and the oscillator) are off, causing an undamped, ringing response.

A possible third minor contribution could come from the sync separator itself, which is shown by the slight wiggle on every row. This may be normal for this set with this bar generator. I have seen it often on sets that otherwise operate fine with a standard video program source. It could also be affected by fine tuning.