I bought new seat covers and foam padding for the seat bottoms from Moss Motors. I put them together and installed them in the car. I am 6 feet tall and when I sit on the seat the top of my head is above the windshield by about 1 inch. I sat in my brother-in-law's 100-6 today and the top of my head was 2 inches below the top of the windshield. Is the Moss foam too stiff?