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Do you know if the DVD is running 50Hz or 60Hz frame rate? If it is 50Hz that may be the source of your flickering.
If the DVD is running at 60Hz then it is probably a power supply issue (in bygone 50Hz and 25Hz regions of the US and Canada the sets made for those regions had bigger power transformers and filter caps to deal with it). Add an extra 60-300uF to the first filter caps after the rectifier and see if that helps. Could also be a 50Hz VS 60Hz issue. If the deflection is firing more often than the PS rectifires are charging the B+, then the sweep may be depleting that B+ faster than it can smoothly recover...Which may be helped by 50Hz video.
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