I have almost same problem , i run 1+4 on 2 monitors and with maximizer the fps is reduced by around 50% , i end up playing at 10 fps at AV , which is close to impossible...

I have adjusted the maxfps and maxfpsbk and i cant find an option to change to horizontal span , so i use Dual View , can someone tell me where can i put the horizontal span option (graphics is HD 4850 (ATI catalyst control center)

Also , is there any way that i can uncheck the maximizer enable option , only on 1 display monitor ? when i exit the window mode from wow , keyclone stops working for a reason i am not aware of , please assist , otherwise i think i am going to get another pc , which will be more expensive that i can afford .