Well, if your projector has composite inputs then it has to have a comb filter (it could have a notch filter, but probably not). I'm guessing the projector's deinterlacing is sub-par, so you should get a deinterlacer (I think your projector is 800x600 native so there's not too much scaling). You can usually get an iScan Pro or iScan Plus for $30-60 on eBay. You should also get Video Essentials (or a Video Standard) to calibrate your display and check comb filter performance. I've never heard of a LaserDisc player with a good comb filter (the few that don't burst into rainbows have the checkerboard problem), so if your player's S-video output is better than its composite, that just means your display has a REALLY bad comb filter.