Looking to make a nice hoppy Pale Ale with Galaxy and Nelson hops. I also have added for the first time a little lactose to the recipe - I'm hoping this will bring out some of the fruity character of the hops and maybe lower the perceived bitterness a little... As I say, never brewed with lactose before so may be well wide of the mark with this! Should I lower the IBU to start with?
Coming late to this - but yes. I certainly wouldn't add lactose, which belongs in cows rather than beer IMO. Maybe just about in milk stouts, but I'm not a fan of it in pale beers, might just be that I'm particularly sensitive to it but it never tastes quite right, it "muddies" the flavour a bit IMO, or at least distracts from it.
If you want to lower the perceived bitterness a little, then just add fewer bittering hops. I know it's become a bit of a thing to ditch bittering hops altogether but personally I'm not a fan, I think the beer becomes unbalanced without pronounced bitterness. If you want to make alcoholic Um Bongo then go for it, but personally I like my beer to vaguely taste of beer.
And there is a school of thought that for the hoppy stuff you're better off mash hopping as it gives the hops a chance to complex out certain staling compounds...