I have G.SKILL Ripjaws Series 8GB (4 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 timed to 7-8-7-24-2N. When i overclocked to 2000, it sort of "automatically" set the timing to 9-9-9-27-2N. I didn't find any problems but can it lead to any memory failures in the future?
It shouldn't give you problems, but of course memory with higher latencies (timings) perform worse than memory of the same speed with lower timings. Still, the difference is small. Tighten the timings if you want that extra bit of performance, just be sure to stress test it to know when you pass the point that causes instability.