Ghost partition, Windows BSOD
Chasing Ghosts
You have successfully removed all windows partitions from your disk, but you have not yet removed all files added during your attempt to install windows. What is left are files in your EFI partition. The ghost is being caused by the file efi/boot/bootx64.efi stored in the EFI partition.
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Open a Terminal window and enter the following command.
sudo diskutil mount /dev/disk0s1 - From a Finder window, open the EFI disk. Next open the EFI folder. Remove the Boot and Microsoft folders.
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When finished, enter the command below.
diskutil unmount /dev/disk0s1
Choosing an Installation Method
Generally the "modified Info.plist-trick" is just that. It is a trick. As far as I know, you can put the Windows installation files on the USB flash drive, but can not boot from this drive to install Windows. Generally, only the 2012 and newer models can boot the Windows installer from a USB port. If you succeeded, then your model must be the exception.
If you have an internal working optical drive, then this the preferred method to install Windows. If you need to buy a DVD, you are better off with a RW DVD. It will take longer to burn, but it is reusable. It is not sufficient to just burn the iso file to a DVD. You must burn the image stored in the iso file to the DVD.
There are two methods for installing operation systems on Macs. The first is the legacy BIOS/MBR method and the second is the EFI/GPT method. It is my understanding that the 2011 models are suppose to install Windows using the legacy BIOS/MBR method. From your post, I assume you were trying the EFI/GPT method.
You can choose which partition or media to boot from by holding down the alt/option key at startup. If a Windows installation DVD is in the Macs optical drive, you will get a DVD icon labeled "Windows". You can select this to install Windows using the BIOS/MBR method. There also may be a DVD icon labeled something like "EFI". You probably do not want to select this icon, since this will install using the EFI/GPT method.
A word of caution. If you using the BIOS/MBR method for Windows, you can not use any Windows software to change the disk partitioning. This must only be done from OS X. However, you can use Windows to format a partition.