Up to this point when I've been combining flavor/aroma hops in a recipe I've generally been working with hops in a similar AA% range (i.e., all high-alpha US hops for example). If you're working with two hops with a drastically different alpha acid percentage and you're looking strictly for a similar flavor/aroma contribution from each, do you need to adjust for AA% or would you simply use the same amount by weight?
For example, if I wanted to get an equal flavor/aroma contribution from Columbus at 16% AA and something like Fuggles at 4%, would I want to use 4 times more Fuggles than Columbus in my late/whirlpool/dry hops? Or is the flavor contribution pretty much the same on a per-weight basis?
Obviously, some tasting and recipe-tweaking will likely be involved, but I'm wondering if anyone has any experience with a rule-of-thumb that will get you in the right ballpark to start.