Having trouble on the install - trhis is turning out to be a disaster. The mounting clip on this thing is a bitch to get on the mounting bracket. There is no way I can mount this thing with thermal paste and not move the heatsink at all. Even the slightest movement after I mount it causes the sink to veer off the processor. Is this sink compatible or do I need a different mounting bracket. The stock heatsink fits right in the bracket and is kept in place by the bracket, but the si-128 was just not designed for this. Am I missing something? Or should I return this.