First thing is where are you taking your temp reading from? Pressure Port or outgoing line? If port then yes I would be a little concerned but not if it ddin't climb above 180-190 or so. If outgoing tranny line then you are probably OK.
Other than that I would just change to a full synthetic fluid that can withstand higher temperatures without degrading. Amsoil comes first to mind. That should give you a better safety margine if it ever gets above 225 or so.
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