It can be a hobby that can get expensive -- occasionally. But these days, RAM is cheap.
OCZ has "EVP" warranty and voltage-protection, but I thought those modules are rated to 2.2V.
You should really set everything back to "auto" and default. You should be able to get the same CPU over-clock at the same voltage you had set before, but if the modules don't run at least on the same divider/multiplier you used earlier (I assume it may have been 1:1 ?), then you'll have to try something different. And of course, you should start with the stock latency settings.
I blew a set of Crucial Balllistix DDR2-1000's -- keeping them just within their voltage spec, underclocking them, and tightening the hell out of the latencies. They went 9 months with a lot of PRIME95 testing and changing back and forth between various over-clock settings.
So I had a set of Crucial Tracer DDR2-800's to replace them. I just can't achieve the same tight latency settings. But I can run at considerably less voltage on a divider or memory-multiplier of 4:5 (CPU : DDR), and get about the same bandwidth in the synthetic benchies -- at a higher memory speed and above the spec for those modules (880). This actually makes me more comfortable pushing the CPU speed back up to one of the higher settings.
Some of the OCZ modules use D9 fat-bodies. If the modules tested out at their stock settings, there may be something you're missing that is making it difficult or impossible to over-clock.
GRANTED THOUGH: I once blew a motherboard memory controller on a system at its over-clock settings, but the entire system would test out error free at stock settings. For that, I"d say to anyone -- be careful how far you push your FSB, even on these newer boards. You'll get a lot more satisfaction over more conservative over-clocks that are less likely to destroy your parts.