Clover bootloader screen resolution

I'm trying to get Clover to change the resolution to something that correlates to my display. I have a Samsung SyncMaster 24" display, with 1920x1200 max resolution. I believe it is defaulting to 800x600 or something near that, as the icons are huge. I've attempted putting the screen resolution in using Clover Configurator, but it never changes.

Any ideas?