I was going to recommend longer bolts and spacers, but then I went and looked at how seat frames bolt down and on the driver side the 2 front bolts go in at an angle so it would not be as simple as I had thought it might be
you have a point there. But you can still bring the back up about 3/4 to 1" and it would help a bit. On the front i would have to look again. But i bet you could get some 1/4 steel inch plate and a vice and bend u some small brackets to raise the front