3
I recommend that you first disable automatic boot repair from a console in Windows:
bcdedit /set {current} recoveryenabled No
Try now if that has solved your problem. If not, you may have to manually set rEFInd. I had to do it in my Dell pc following the instruccions in the rEFInd website, in the "Alternative Naming Options / Renaming Files Manually" ...
1
I run elementary on a mini. I've run dual boot and just elementary. I've always had more luck with refind than with just grub. It can be installed but you have to disable system integrity protection. OS X daily has a tutorial.
http://osxdaily.com/2015/10/05/disable-rootless-system-integrity-protection-mac-os-x/
As for partitioning. A root partition and a ...
1
My refind config file is this:
resolution 1366 768
use_graphics_for linux,grub,windows
dont_scan_dirs /EFI/ubuntu,boot,/EFI/freebsd
default_selection "Elementary OS"
dont_scan_files /EFI/Boot/BOOTX64.EFI
menuentry "Elementary OS" {
icon /EFI/refind/icons-backup/elementary.png
loader /EFI/ubuntu/grubx64.efi
options "acpi_backlight=vendor resume=UUID=...
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