Enhance Intel SpeedStep® Technology allows the processor to lower the speed when it is in idle or low work load, this will allow the system to save power consumption.
The Intel Turbo Boost feature allows the processor to increase the clock speed when it is needed, like when it is in full load.
So basically those are 2 different features, however please keep in mind that the operating system is the one that determines when to use the Intel Turbo Boost and when not to use it, so the user cannot determine the usage of the Turbo Boost feature manually.
I would suggest contacting Microsoft* Corporation for them to provide you recommendations about which power plan to use, regarding the BIOS options, you need to contact ASUS* so they can provide you recommendations on what options to have enabled / disabled to increase performance behavior. Please keep in mind that since Intel® Corporation does not manufacture ASUS* motherboard, Intel® is not familiar with the BIOS of those motherboards.