The only beer I had heartburn from so far is grist house conspiracy tangle. Its a Pittsburgh local beer. I had heart burn before I even finished the beer. They describe the beer as
"It's easy to get tied up in the massive aroma of this hazy concoction with Cashmere and Simcoe hops conjuring notes of melon and citrus. The base of lager malt, raw wheat, and flaked oats forges a light, silky palate for the hops to shine. Juicy and full-bodied, this New England IPA captures the mind as well as the taste buds."
Its not the wheat nor the flaked oats for I have had these before. It did seem more bitter so the IBU may have been up around 70. I have had dogfish 120 minute which is 120 IBU with no heart burn but honestly come on reduce the IBU!!!
I will have to research the oil levels to see if that is the potential culprit.