First of all, you don't have the block installed properly... where are the springs, spacers and washers?
I've owned a few HK blocks, and they fit "snug" on all the boards I've tried (EVGA x58 micro, x58 LE and SR-2). The mounting holes on the LE didn't quite line up, but with the proper mounting hardware, I was able to angle the screw slighty in order to get it to line up with the spacer.
G'luck.
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