Is the heatsink anodized? If it's black ano then you may have the generation that had the weaker, non-AMD-approved clip, and that could be contributing to the higher CPU temperature. The silver FOP32-1 was AMD-approved with two changes over the old FOP: 1) it was not anodized, just bare aluminum, per AMD's requirement, and 2) it had a stronger clip to compress the shock pads at the corners of AMD SocketA CPUs, so that the heatsink made good contact with the core.
It's also possible that your system just gives higher temperature readings for other reasons. Your A7V motherboard uses a socket thermistor on the surface of the motherboard to read the temperature, and it can be influenced by the airflow patterns of the case. For instance, if I put my A7V in my Inwin Q500, I could put a fan on the backside of the mobo tray, which has big holes in it, and probably swing my socket-thermistor readings by several degrees Celcius just by cooling the underside of the motherboard.
If you're not using a thin layer of thermal paste/grease, try that, especially if you are using the AMD-approved bubble-gum stuff as the thermal interface material. Thermal grease will perform better.