Is it just me, of are your top and bottom leaves yellow in color, can you take a better shot, possibly a little closer?

And the tin foil is a bad idea, causes heat spots and might burn your plants, you will be better off with panda film or flat mat white paint, believe it or not white is about 85% reflective of light. Tin foil is out.

I love the CFL setup, looks pretty sweet

And your leaves indicate you are definitely growing a Sativa.