Bingo thats how I do it. Replace some aroma/flavor hops with FWH. It's not just for Big IPAs either in fact, I believe FWH is a traditional Lager technique. (Noonan mentions it in his book)
I've got a low gravity bitter I'm gonna FWH .25oz styrian gold and then do only late addition hops for bitterness, 1oz challenger, .75oz styrian gold for 15 minutes. (1.037, 22ibus)
So I'm combining 2 techniques: FWH and late addition only hopping.
You definitely get a smooth, round bitterness throughout.