Well i will tell you what i did with Ikaruga...might be helpful,maybe not.
I got it 6th Sept,and Megalexxx soft didnt support it yet. I burnt it with DJ 3.50.05.830 + LG 8080B using the default settings.Soon i noticed it was 50hz,i have PAL Dreamcast + RGB.
I used this patch
http://www.gamefreax.de/cgi-bin/game...ez/adr-ika.zip
and burnt again,worx perfectly in my 2 dreamcasts
If this still doesnt work for u,try booting the game with Utopia,ActionReplay/Gameshark.There are images of them in megagames.com