Recommend settings for Galaxy Grand i9082. Help needed from the experts :)

[Ammarmsms]

I read some thread about Project Diva Extend in this forum and ive found that if you disable Vertex Cache, the fast blinking will disappear hence add more speed and constant fps. But still the music isnt synced and somehow the speed drops. But its weird that my device is much more powerful compare to Xperia Play but it seems that i cant figure out the real problem here. Plus, once i rooted my device, the official Malaysia firmware downloaded at Samobile turn into custom rom when im checking it in download mode. Can someone tell me why?