If your paranoid about it then just go ahead and re-seat your heatsink. =/
If you spend alot of money on your computer, you sure want everything perfect.
This is my case, I spend alot and if consider the amount of money that I sepent and compare it with the thermal price ...
I really do not know how paranoid I am.
I live in a hottest country on the planet and temp really matter to me.
so I think I will reapply the thermal again and see .