ok things you could try
-Drop the resolution down, try using the Native x# scaling, somewhere around x3 should look pretty decent but not be so demanding
-Try with AF disabled, maybe try the "Allow 8 bit texture" option, but make sure AF is disabled before you toggle this as it disables AF and could show a false improvement in speed if you are comparing it to AF x16.
-Try lowering the Blending Accuracy to medium, the light will be a bit more overpowering but it might run faster
-Try disabling MipMapping, I don't think this game uses it but I don't know if you will have any performance impact from it being on.
as for your stutter in framerate, do you mean it just looks choppy all the time? Because that is a result of the VU Cycle Stealing speedhack, not much you can do about that unless you want a lower framerate!
Oh one other thing, I'm not sure what version of the emulator you are using, if you are using 1.4.0, I believe there was a problem with Skylake CPU's, not sure if it also affects Kabylake, so it could be worth trying a newer version from here:
http://buildbot.orphis.net/pcsx2/index.php
Just be sure if you overwrite your existing version of PCSX2, you also delete the plugins folder first to make sure you aren't stuck using an old GSDX (there have been a bunch of improvements to compatibility and speed since 1.4.0)