Reporting back on it. Saving battery with it's limited settings in STweaks had little noticeable affect and made my SGS4 rather laggy, particularly on long saved videos, that would often stutter. Boosting up to the extreme made my phone run hot and literally eat battery, so much so that using Sygic to navigate at work for work with it plugged into the battery charger still wasn't enough to keep it from losing charge, and I had no discernable performance improvements. I purposely did not bench mark or take measurements of anything, because they mean not a jot, it's how the phone behaves that matters in the real world that counts.
So I'm still running it on standard settings, no problems with it there, so no point in going back.
Samsung Galaxy Note 3 SM-N9005
ROOTED STOCK FIRMWARE PHILZ TOUCH RECOVERY
"The only foolish question is the question not asked"-Anon