Temps looks OK for me considering that Tuniq doesn't have the best finish of the base by default. You may consider lapping the thing, but do make sure to keep the base flat. Mounting of such big heatsink may not always result in proper contact on all CPU surface. Also thermal grease type can influence the temps and changing to something like Arctic Silver can drop couple degrees. I personally use Liquid Metal Pro compound, but that thing conducts electricity and should be applied/used with extreme caution not to burn the hole thing down

But still it's the best heat conductor