Many of the best IPAs are far simpler than your grain bill. You don't have to get too tricky. Smash beers can taste great in their own right. I would strongly consider at least one time trying 95% Marris Otter/5% carapils or flaked wheat just to see how tasty a simple bill can be.
If you want caramels or sweetness, either raise your mash temp or take a quart of the first runnings and caramelize them in a saucepan. I do this regularly with MO/single hop beers and they appear far more complex than you would think. Try brown sugar for a sugar addition and you have a super clean and tasty beer that lets hops shine.
If you are using delicate hops like the ones from New Zealand...try 50% pilsner, 45% MO, 5% carapils or flaked wheat.
Trust me, I am in your boat. I tend to go really crazy with malt bills but I took a leap of faith this winter with my NZ hop project and I was very pleased with a simple, clean, light malt bill that really lets you get at the nuances of the hops.