ROFLROFLROFL aquagate....
No u cant do anything to that system, the pump is lacking in power, and sorry to say, a sycthe ninja with good fans will probably get close to the cooling of your system.
Trash the entire kit or leave it as it is and upgrade to a better one, something preferable in the range of 200 dollars. Otherwise dont waste your time trying to tweek it here and there, the more tweeking and modifications you do for a system already max'd out, the more problems you'll run into.
Edit: yes having 2 radiators will restrict flow and hence cause more problems. But i have done some testing on my old X2.
i realized that instead of having 120x3 in the front, which also makes it very hard because i only have 2/11 bays my case offers, i got simular and sometimes even better cooling when i split it to 120x2 and 120x1. Bear in mind tho im using 2 D5 liang pumps so i have more then enough flow.
But my current loop is setup like this
Res (about to get rid of it soon tho) -> T-line/Bleed/Drain line -> Pump -> 120x2 -> Cpu -> 120x1 -> 7900GT -> 7900GT -> res
My video cards are kept cooler because of the intermediate cooling.
The Cpu Differences was seen by 1-2C at the most favoring the 3x120, but the videocards had a temp difference of about 5-6C which made me realize this loop is better suited for me.
But as i noted im using 2 D5 pumps so i wouldnt recomend this loop as its very restrictive unless ur running a iwaki class pump or 2 liangs.