Only problem I have with graphs is apparant disjuncture from user experience. I would say that every person I've ever heard of removing the IHS has noticed at least some sort of temperature drop, which includes air-cooled heatsinks, having a significantly lower effective value for h than ~20K.
IMO, theoretically the IHS only helps those with aluminium based heatsinks, or for those heatsinks that use a way-too-thin amount of copper material between the core and the fins. In practise, I have not seen anyone report higher temperatures with the IHS removed.
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