This really just comes down to time management. Do you loose most of the games on time but still end up with a decent position? If so then you need to work on cutting down how long you spend on developing your plan and calculating the moves out for it. If it is the other way around, that you start getting into worse positions but are doing ok on time then you may want to ride the clock a little closer (that is take a little more time with the moves even though you are in a timed game).
My untimed chess game keeps increasing, but my timed is just getting worse.
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In my online "untimed" games, I've won 8 of my last ten and am at a 1600 rating. In my timed games, I've lost the last ten straight. Any tips, thoughts? It's frustrating.