Hiya!
I am hoping someone pinpoints me what I am doing wrong

Started working on my groovymame setup and currently for ease of use I decided to do the initial emu/roms/frontend setup next to my main pc using a 1084S monitor. The machine is running win7/x64 and has a 2GB 6450 vga.
The driver setup went fine and I have a really nice 640x480 desktop displayed on the 1084. I followed Calamity's guide installing the driver and the modes and I got 15 modes installed, just like the picture he attached in the guide :
http://geedorah.com/eiusdemmodi/forum/viewtopic.php?pid=1052#p1052 , I attach some pics of the VMMAKER settings:




and this is what I get when I try to run SFA3 with the same command-line as the one at the tutorial (using the latest 0.171 GM) :


here is an example of a vertical game - this one runs fine with an interlaced resolution:

so apparently lower resolutions are not available or something, I tried setting other emulators like Magic Engine or KEGA fussion to use the 2560x240 resolution but they quit with errors about the screen mode.
Arcade_OSD on the other hand doesn't seem to have issues displaying the 240p resolution:

I gave a shot with the GENERIC_15 profile, didn't made a difference though.
So what is going on here?

What did I do wrong?
Any help will be greatly appreciated, thanks in advance!