Your screen shot and last question are the same thing. You can turn off os-prober and edit at will or delete entries in 25_custom. Just only change the menu entry in the quotes as that is what you see or delete entire boot stanza or it will not update. Each boot stanza is from menuentry line to last line }. I had an error in one of mine - missing end } for several years and never noticed a missing stanza. When grub updated to 1.99 it would not update anything until I found my typo.
I have only shared data in NTFS partitions. I do believe someone else posted a question on permissions, but NTFS does not support any Linux ownership nor permissions. You do have to set defaults when you mount with fstab. Windows 8 may do its own thing, but I do not have Windows 8 and do not plan to.
I multi-boot Ubuntu and cannot hibernate as I share swap. But some systems have issues with hibernating, both with Windows and Linux. It will not boot a lot faster, but if it works for you.