hmmmm. How much was the fuel pressure adjusted by. There is a flap each side of the inside of the boot under the carpet. These perish and let fumes from the exhaust into the boot of the car which may be what you are smelling. Check you havent got a leak in an injector or the fuel pressure regulator or the fuel rail.

stage 1 is usually 15psi which is wot mine was and i got about 50 miles to a tenner so sounds like something isnt quite right.