Mosfet Heatsinks to Use With 8800GT Cooling?

I'm using a VF1000 to cool my 8800 gt. I have enough memory heatsinks and the cooler is attached correctly. However I'm having some problems cooling the voltage parts on the side of the cooler. I have some mosfet heatsink coolers on them, but I don't think they're doing the job very well because I'm getting occasional artifacting and errors, and the other day, one of the heatsinks fell off O_O. So I'd like to know from anyone on the forum if they can suggest any good heatsink coolers for the voltage parts that have decent adhesive that wont fall off, and will still be able to cool it properly. Thanks in advance!