There was a mistake in the installer, which I have corrected. I've now installed this about 5 or 6 times today with different settings and it worked each time. Hopefully it works for you too. I need a few people to try setting cores to different frequencies with the installer and let me know how it goes. I'm now running 1890 on core 1, 1728 on the others and it seems to be pretty solid.
Download:
ElementalX-m7-0.3
Changes:
-fix installer
-set gpu frequency correctly
Under ideal circumstances, there is a performance improvement from overclocking the graphics. But I get inconsistent results (sometimes higher than stock, sometimes lower). The problem, I suspect, is heat. Either the overclocked GPU is being throttled by the thermald, or it's getting hot and sometimes making errors, or it's simply unstable on my phone. Any of those things will cause inconsistent benchmarks.