I don't know of anyone that has overclocked the GPU above 400mhz and run the RK3066 stable in a tv stick at 1608 & DDR above 300. The kernel in the first post has the GPU at 400 and DDR at 600 - those are the highest stable clock speeds for RK3066 in our devices.
400mhz is the highest you can expect a stable ROM, and trust me - I've had them run up to 650mhz GPU but eventually the ROM goes haywire.
If not we can try a 533 or 548 DDR speed for yours.
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