Fred,
Make sure your thermometer is on target (see the other question you asked) first. It sounds like it may be reading a little on the high side.
Assuming it is on target, you can adjust the thermal properties of your mash tun slightly to "tweak" it to match your equipment setup. I would recommend adjusting the "Mash Tun Specific Heat" parameter down slightly. This will reduce the equipment adjustment needed. This number appears in the "Equipment" profile.
Cheers!
Brad