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There are no adjustments necessary unless you check the RF/IF alignment. The horizontal drive adjustment, if the set has one, will make no difference.
What may be useful to post the schematic of the horizontal sweep/ video amplifier section to see if there is a blanking circuit present.
It may also be due to RF radiation of the horizontal retrace spike being picked up by the tuner. It may help selecting another channel to feed the set. It also may help to move or shield the wires leading to the deflection yoke.
Other things to consider are consumer box sync generators which exhibit too fast a fall and rise time. You may wish to try another set top box. Also alignment of the IF where the video carrier is to low on the Nyquist slope or a faulty IF tube (check by substitution one-by-one ensuring the original is replaced in its original socket).
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