Video recording improvements in build prop?

I wounder if it is possible to tweak in the build prop to get more fps in the 4K video recording?
I use the two 7.1 roms on the two links below on my LG G Pro 2 D838 and everything works great except the 4K recording, if I acitvate the 4K mode the live screen in video mode lags alot and the recorded videos have about only 15 fps.
On the stock Kitkat 4.4 and Lollipop 5.0 the fps is on 30 stable.
I have tried alot of different camera apps and they all give the same result.

So anyone here who can give me som advice where to begin?

TWRP 3.1.1-0

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