Well, I did some testing and found out that using either the "Natural" or "Bright" custom image yields the closest between the back LCD and Lightroom. So it looks like I'll stick to using either one of those. Highlight correction did absolutely nothing to the highlights in the RAW files on Lightroom. No exposure compensation was used during testing either.
I want to say thanks to everyone who helped out. I really appreciate it!!
Testing as follows:
Setup up tripod, set exposure, take picture with different custom images and with/without highlight correction.
At the end, I did a factory reset, set the WB to match the rest of the pictures, then took another pic.
Lens used was the K24 f/2.8
All pictures were taken at ISO200, f/5.6, and 1/800th. Calculated using Sunny 16 and then "overexposed" by 1 stop for some shadow detail. WB was custom set to 5500K.
Modified Muted profile:
Muted w/ Highlight Correction
Natural profile:
Natural w/ Highlight Correction:
Factory reset + 5500K WB to make it even.