FWHing is great
Due to the drastically increased hop utilization, they do recomend using noble hops. There is the potential for a couple things if you are moving your 60 minute addition to FWH.
1. FWH gives a MUCH different bitterness perception than a 60 minute addition will, much more complex and notably milder.
2. Moving a high alpha hop to FWH could really end up blowing you away if it is a harsh hop.
FWH in my experience has offered the equivilent of 30 mins of bittering perception and TONS of flavor. I have made adjustments in the settings of ProMash so that I can formulate recipes that utilize FWH and it will compute not the TRUE IBUs but will give me the PERCIEVED IBUs... which is what matters when tasting.
Bottom line, it is your beer, you do what you like and try what you think is worth trying.