I make a cream ale with no boil hops, the hops go in after the fire is off and the boil subsides. I use about 8 oz. whole Mt. Hood for 10 gallons, run by he pump and whirlpool for 45 minutes. I get good flavor, some aroma, and bitterness around 20-25 IBUs. If you add at 170F you will get more aroma, a little less flavor ( I think), and much less bitterness. High alpha hops at 170F will make up for the diminished bitterness from what I have done. High oil hops (e.g. Citra) should help boost flavor and aroma.
It comes down to the beer you are targeting, the hops you have, and how you use them on your system. You can also add some hops when the whirlpool is around 210F, then more at 170F, some add more hops at 120F.
Brew some beers and see which works for you. Tell us what you like, so we get more feedback on doing this technique.
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