Core temp seems to report a little over on the Conroes for some reason. If the systems stable then everything should be ok.
Good way to check for a dished IHS is spread a thin layer of paste on the CPU's IHS then mount the cooler and run the system for a few hours to give the paste chance to bed in a little.
Whip the cooler off and check the contact patch on the base of the heatsink. If you've got a fairly even IHS print on the sink then it's pretty good. If theres a big blob in the middle which has no paste, and the corresponding paste patch on the CPU looks untouched then the IHS is dished.
You could lap the CPU but really its probably not worth it for the gain you'll get it also voids the warranty and can be fairly easy to mess up if you've never lapped before.
Removing the IHS from these CPU's seems fairly easy in practice. Use a thin blade to cut the glue around the sink, then heat it to 90-100 deg. Wouldnt reccomend it to anyone though, again the gains are minimal. For 99.9% of users it's not worth it, the gains are minimal, the risks are high and mouting coolers has an added risk.
@Drazic not everyone has your technical/overclocking knowledge and it was somewhat clear from the guys posts that lapping the IHS/popping the spreader probably wouldnt be applicable in this instance.