I'm using a Wacom CTE640 on an Intel Mac. No problems here with over-sensitivity in Poser 8.

Do you have a second screen, with the tablet mapped across both screens? I found that this caused over-sensitivity, so I have the tablet mapped only to my main screen now. It's a pain having to switch to the mouse for the second screen, but I generally only use the tablet for Photoshop anyway.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)