It has been said many times before. A the Adreno 205 in our phone and basically all Adreno chips are CPU/GPU integrated into one chip. When you overclock yoour phone you are also OC your GPU. Devs who have managed to OC the GPU by itself have run into issues that were not conducive as a daily use. Many have tried and it has been said time and time again.
Now that being said just doing a quick search for Adreno 205 Overclock GPU XDA brings up dozens of pages of where other phones with the 220 and or 205 were said to be overclocked, but then reading down even more its not overclocked.
Hate to rain on your parade and your thread, you are certainly welcome to try but even devs with loads of experience, DoomKernel himself, has been unable to make a GPU OC, in V13 of his DoomKernel for XP he quickly released v14 and reverted the GPU overclock due to issues.
---------- Post added at 04:31 PM ---------- Previous post was at 04:24 PM ----------
Given the age of our phone and its hardware I think what we are able to do is about the best we can get out of our beloved device. I am sure there is always room for improvement but without all sources from Sony (Ericsson) and Qualcomm I believe we are at the limit of what can be done to our device. Its either be happy with where are device is and be happy that it plays MC3/MC4 and a boatload of emulators with a sweet kicka$$ gamepad, or bunker down and buy a newer device with far better specs and no gamepad/touchpad/triggers.
Now, I was able to use a GS4 for a week and an HTC One, and as much as those device are beautiful in their own right, gaming is horrible. I quickly came back to my PLAY and am very happy with this device still, yes even with its old age and its issues, I am still a happy camper.
Now, this being all said, if you want to work on making an Ultra Kernel I know myself and several people would happily give your kernel a shot. Please dont take my comments as demeaning or belittling. I just think people need to realize that at this point theres very little improvement upon whats been done.
Now, that also being said if you want a beta tester for your kernel I would be happy to test it for you.