i suspected that...i think you are pretty well set as far as temps go. nothing to worry about. A better HSF would bring the cpu temps down a bit more.
Ivy's have a higher tj Max compared to sandy bridge so you should be okay. I prefer to keep my sandy below 75C as i run a stock heatsink and compound(which are indeed quiet capable) but easily hit 76-78C running Folding@Home at stock speed 3.1Ghz without turbo boost.