i finally figured out what is causing VboxHFS.efi to list a bogus Microsoft boot option as compared to HFSPlus.efi. I recall Dr Hurt and others mentioning the same issue.
well clover is not finding an extra bootmgfw.efi as suspected - it finds a leftover /boot file and just presents in the GUI (a no-op on click). this file is a legacy clover boot file from when I used to boot via MBR.
as mentioned - move to clover and be done! getting intel speed step including turbo is generally a simple matter of SSDT and using the right product/model. like mbp6,1 or mbp8,1. - the i5 520m is a pretty common CPU in the 2010/11 era.
Yeah, I want find the problem or difference between both bootloaders, only for this I used Chameleon, for make a dump and compare with the Clover dump. Was only for not install all OS's again.
Chameleon: Turbo Frequencies
Clover: No Turbo Frequencies
in addition to above suggestion... you may need to do something like this
add to ACPI section... assuming your tables are named as such: