Excluding a 60 minute bittering addition and acheiving correct bitterness from late additions only gives a nice more rounded bitterness, and also helps with great hop flavour if thats what you're looking for.
Whilst a 90 minute bitterness addition gives a harsher bitterness than a 60.
This is not what you're asking but may be worth something.
Achieving charcoal-like bitterness in Pales