I Would like to take this CPU:
E5620 batch 3204B939 - does 32M at 269 BCLK, core does 4500 1.28 and 5000 1.52, cache does 4000 at 1.28 VTT. Asking 12 Euros + shipping
Nice Score! With your problem that the whole board is under water.
I would definitely use more art eraser and additionally lay everything properly with cloths.
The big fan that blows on the Northbridge has a big part in it. I would lay out a lot of cloths so that the airflow doesn't get through to the board.