Final Fantasy Type-0

[Darkus]

Any recommendation for performance settings to play this on a Galaxy S4?

It's playable, but irritating. I average around 60-80% speed in combat, but 90-100% elsewhere.
I've been playing with settings for 2 hours now, and can't seem to find a better configuration.

Edit:
Best settings configuration i've got so far;
Non-buffered Rendering
Simulate Block Transfer
Frameskip 1
Frameskip Auto
Mipmapping
Hardware Transform
Software Skinning
Vertex Cache
Lazy texture caching
Low Spline/Bezier curves
Texture Scaling/filtering all Off/xBRZ upscale type/Linear filter
Fast Memory
I/O on thread
PSP2000-3000

Edit 2:
Playing around in the airship near the beginning (where you activate the crystal to blow the door open, or something like that.)
Activating it causes a drop to roughly 20%, if I have non-buffered rendering on, it just shows this red ball of light on the screen. If I turn buffered rendering on, it shows the door blowing open, fire and all.
I guess I should let go of any hope to play this comfortably on my phone, and will just have to use my old psp instead.
Been awhile since I took that thing with me anywhere.