If I remember corrrectly, Denny modifies the FWH utilization percentage in his software settings to make it equivalent to a 20-minute. Personally, I've found doing that leaves me with a little too much bitterness "bite" so I've started letting FWH calculate as a 65-minute addition.
Yep, that's what it seems like to me. I had some beers analyzed and it looked like FWH contributed maybe 10% more IBU (27 rather than 25 in the beers I had analyzed) but that's a pretty small sample size. But subjectively, it tastes more like a 20 min. addition to me
. Everyone should do like you did and decide for themselves. BTW, if anyone wants to recreate this experiment, let me know and I'll see what I can do to hook you up with a lab. It would be great to have a wider range of data points.