That's probably one of the milder hop schedule you're likely to encounter, though some may find some peppery quality in Magnum that they don't like. I have trouble with hops Ekuanot hops and any IPA I try that uses them I find unpleasant. Some other hops will have a harsh bitterness but can be pretty heavenly when used for later additions - El Dorado, Citra, Simcoe, Mosaic come to mind. Some piney/catpiss hops like Chinook and Cluster can be downright offensive to some folks.
You'll likely find that working with your water profile will help. First try not adding gypsum at all and use that as a base line. I find a huge difference in perceived bitterness when I up the quantity of gypsum. Try getting as close as you can to the malty water profile or balanced water profile but keep the sulfate/chloride ratio at 1.0 or lower. If you try brewing the same malt and hop bill with different water chemistry, you'll quickly dial in on a preferred style and/or accurate replication of a particular beer.