If your pj can accept 720p @ 50hz rather than 720p @ 60Hz this solution will give you the best pq:- Set the 2910 to Auto, rather than NTSC.
With it set to NTSC, the 2910 is converting from PAL @ 50Hz to NTSC @ 60Hz and then sending out the signals.
With it set to NTSC, the 2910 is converting from PAL @ 50Hz to NTSC @ 60Hz and then sending out the signals.