I rebuilt a wheel with a power tap for a friend. He is about 225lbs and strong as an ox. Can generate over 800 watts for a short time on a climb. He actually broke 2 Mavic OpenPro rims.
I rebuilt the wheel the second time with a Sun rim and had to up the drive side tension to 130kg because he was breaking the NDS spokes at the nipple.
The power tap has a little extra dish because of the design of the hub which makes for lower NDS tension.