I‘ve compared your N900 version and dingux vesion 1.12(based on GP2X version 1.33), it seems the files you've edited are .settings default.cfg and oldplay such three, the other files are both the same except the two files about gpu.

Then I tried to set .settings and default.cfg just as dingux vesion, and higher cpuscale, nothing changed.

I found the dingux version's oldplay.dge is bigger than N900's verion,it's 4416 while N900 is 3337KB. and then, finally, I have no way out...