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.