Got an update for you.I've managed to update Asteroid and the hashrate is much more stable,in fact it's fixed my issue more or less (meaning that I can sell contracts again without worrying about misrepresentation issues caused by unstable hashrates).Would would have thought that a software update was all that was needed? Now I don't have to waste time with any other approaches.
It doesn't reach beyond 2GH/s anymore but I'm sure they can still be overclocked (but first get a fan) for a better hashrate.
Thanks for the suggestions though.

Glad to hear the update fixed it for you, as I said I tried it and it was very buggy, would never close down properly etc after mining and sometimes wouldn't let me start at all. They must have fixed it.
Have you felt how hot it gets running at 2.0? I would still use a fan, with a simple USB fan they stay barely warm to touch, without they are too hot to touch almost. For longevity a fan is a good idea. Look on eBay for Arctic Breeze USB fan, very cheap but very useful.
