Yeah the grist and hops look good for a Porter, and 35 IBU is perfect.
My usual Robust Porter grist is 80% 2-row, 8% CaraMunich, 8% Brown, and 4% Midnight Wheat. No roasted barley; save that for a Stout. Or if you don't have Midnight Wheat, use a tiny amount of Black Roasted Barley (like 1%) for...