Given your goals, you would probably prefer a hop schedule closer to this:
13% hops early
8% hops middle
25% whirlpool hop steep
Your palate may also not agree with the harsher hops like Columbus & Chinook. These hops can be kind of resiny and dank for the new IPA drinker. Options such as Amarillo, Cascade, Citra, or Centennial would be much lighter --more floral, citrusy, and fruity-- on the palate.
Bitter lightly at 60; perhaps 30 IBUs. Dryness can also boost the perception of bitterness, so for your goals, you may want to look into masher higher.
Lastly, be sure you are pitching the right amount of yeast starter, fermenting at the appropriate temps, and giving the yeast enough time to clean up after themselves instead of bottling 7 days after you brew. Fusel alcohols and strong, headache-inducing effects may result with improper yeast handling.