When you say 'get rid of the fakeraid and put 2 disks in RAID0', what do you mean exactly?
If you want both windows and ubuntu to access the data on those disks, the only choice is fakeraid. If you were using only linux, then software raid is recommended and works much better, but windows can't read that.
So, if you want both OSs to be able to use the array, you will still need to have fakeraid only it will be made up of 2 disks instead of 3.
To be honest running the 3 disk raid0 is probably a bad idea. I hope you are aware that if one disk dies, the data on all 3 disks is completely gone. That's how raid0 works.
You get a slightly faster transfer speed but the risk to the data is much bigger.
You can consider simply having all 3 disks as separate. You still have the same total storage space, but there is less risk for the data. If a disk dies, you lose only the data on that disk.
And by installing on a single disk instead of raid array, your install problems might go away.
The choice is yours whether you want to run 3 separate disks, or one disk for the OSs and a two disk raid0 array.
In any case, it's better to install win7 first and make the partition with the size you want to allocate to it. Leave the rest of the space as unallocated for ubuntu. After that install ubuntu.
For bootloader, I would use grub2 since windows bootloader can't boot ubuntu. It's much simpler, provided the installation goes fine of course.
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