Personally i'd be going the .990" bars, i don't think the .920"s would be enough to keep the firm feel. I don't think the .990"s would be too harsh if you are wondering either.:-D
i agree. when i had the 920s in my big block dart, it rode like a normal car. in the slant six duster they are a little sporty feeling, but i would definitely go to the next size you can get.