I'm just about to plumb a 2nd TLF as well. I'm currently running Rowaphos but will be doing GFO and carbon.
From what I've heard, the setup on the right will tend to clog up the carbon faster. Not sure why but someone said that if you have the GFO tumbling too quickly it will degrade and move to the carbon TLF.
Not hi-jacking but what pump do you use? This may affect the result as well.
I'm leaning towards the setup on the left.
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