You do whatcha gotta do to get beer in the fermenter. You're committed to the hobby, dude!
Try it by "steeping", and if you don't like it, try it another way. IME, Waldo Lake Amber is a beer worth brewing multiple times (as well as a good base to start your own hoppy amber recipe).
As far as IBUs go - this is where brewing software comes in handy. FWH and a 60 min addition give you different IBU figures, so use software as a guide to nail down these numbers.