Hmmm you could carefully bend them with some tweezers... CAREFULLY!

Those fins are cheaply hooked onto eachother with metal tabs.
@Silverwolf38401
You may want to remove the two heatsinks and the old thermal paste and replace it with Arctic Silver 5. Also, make sure the 8 black screws on the underside of the case (located in the middle) are tightened. Those hold the HSs down snug.
-R