if you're in ym situtation and getting 64c load temps on STOCK VOLTS, its kind of worth it. Yeah its soldered, but that doesn't mean its good solder, or even good contact. Obvously its not. Not when my x2 3800 @ 1.5v and 2.7ghz was getting 20c lower temps with the same water setup.

As for a custom mounting solution, you can put 4 -5 layers of electrical tape along the edge of your cpu. Or layers of foam, what ever. You also eed tpo shave your heatsink/waterblock to fit inside the socket hold down. and also use 4-5 layers of electrical tape for "feet" around the core so you dont crush it.