I have the FD+ mounted on a Legend 8800 (89 wide) and I am 5'7'' (158 lb). I did not noticed the extra height skiing In powder. On piste, it will partially help to compensate the difficulty that wide skis pose to carving, but the leverage is far lower than a regular piste ski with regular plates. Besides, the lower weight is always appreciated on long touring walks or when you carry on your skis in your backpack.

if all your looking for is a resort/slackcountry or an occasional day touring binding i would recommend the dukes hands down. the extra weight is really nothing you will notice. looking at the specs the new dukes are 2lbs 15oz and the fritschi's are 2lbs 4oz. the dukes in my opinion are a much more sturdy well build binding, not to say the FR are not but the duke has virtually no roll and a zero chance of having the binding switch into touring mode accidentally. also i would look into a slightly bigger ski, depending on your size the Atomic RT-86 may be a bit small at 86 underfoot for either binding. for me i would stick to anything around 99 underfoot. but depending on your body type and style it shouldn't matter too much.