Ok, so I used the IBU calculator in Brewfather, set my target to 45, and it has reduced the first four 20g additions down to 13g each.
If I do it this way it means I have 14g each of Citra and Amarillo left over. I’m thinking I should chuck ‘em in the dry hop to make the most of the aroma?
Aye. Bang them in as a dry hop.