Thank you for helping me out
Looks like I'll have to configure the default screen mode via the Win app since there is no options for this in the global settings.
I know USB Loader GX since I've first modded my Wii but back then it didn't had support for some essential features (NTSF and wbfs file type support) which were present in CFG USB Loader and all till now I never had any problems with it. Oh and USB Loader GX is out of date if I'm not mistaking.
Just for info I managed to change partition numbering without wiping my drive which is quite awesome. I had to add a fat32 partition on the end of the disc right next to the existing NTFS partition. The problem was I needed the Fat32 partition to be 1st primary partition instead of 2nd because I wanted to run GameCube games from it. The safest way to change this is by making a backup and wipe the whole drivve followede (btw this is also the most time consuming way). Or you do a much risky task and modify the master boot record (not recommended at all except you REALLY, really know what are you doing)... But there was another way. I used Linux (ran it from the GParted Live CD) and the fdisk tool to delete both partitions and create them on the exact same place with different numbering. And it worked! (BTW this task is quite risky even if you know what you're doing, but I tested it first on my spare empty usb storage devices) yay \(^o^)/
Thanks again