Yeah, my advice is to not bother. You'll get a couple more FPS but at the cost of stability. You already have a much-higher-clocked card, why not just let it go? Your eye can't see that many FPS anyway. LOL.
It's like CPU's. I fully support unlocking a CPU that can safely run 50% faster, like the mobile Athlons that you can just set to 200mhz. But when people go on about overclocking to get that last 5% out of the chip... why bother?