So I've tinkered a little bit with the override and I've got 1366x768 which is better, but still far from the ideal 1600x900. In the attachments you can find SysPrefs>Display and RDM screenshots, along with the override file (I had to add the extension to the override again in order to attach it). Here's the terminal commands I've used:
sudo defaults write /Library/Preferences/com.apple.windowserver DisplayResolutionEnabled -bool YES
sudo defaults delete /Library/Preferences/com.apple.windowserver DisplayResolutionDisabled
sudo mkdir /System/Library/Display/Contents/Resources/Overrides/Display/VendorID-9e5
cd Desktop
sudo cp DisplayProductID-6f3 /System/Library/Display/Contents/Resources/Overrides/Display/VendorID-9e5
sudo reboot