I installed PAC(KitKat, latest nightly) on my GT-N7000(Galaxy Note) which has 778mb available RAM, and I get around 380mb used after clearing recents, and 355-ish after the phone has been at rest for some time. Mind you I haven't got too many apps installed which have background services, though. But I'd still say it's good RAM management.
But as for what you should do, I think you should take @iamashwin's advice...He knows what he's talking about.
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