When i went from my s963 with a vantec tornado to this a70, my idle temps increased but my load temps dropped also. I think the reason for this is because heatsinks have what i would call a thermal ceiling. Lets say you put your cpu underload, at somepoint, depending on how much heat you put into the heatsink, the heat will get too great for the heatsink for effectively remove heat from the cpu. I think the higher idle temp is a byproduct of having less airflow, but having bigger/more heatpipes really shine when they need to, and thats when your cpu gets hot. This is just my opinion, i could be completely crazy and wrong
Also, Curing time for thermal paste, case flow, mounting position etc also play a factor in temps. Bottom line, i dont care what my idle is, all i care about is what happens when my cpu is hot, and this a70 does a very good job there.