I haven't tried it yet, but I suspect that putting the under dash cover back on could help deflect some of the little light rays to bounce back thru the instruments instead of down in the foot wells. I don't know if it would be enough to make a difference though. A lot of light does shine down in the footwells so some sort of reflecters on the bulbs to direct the light thru the instruments would help. Its something I have thought about before, but not enough to try and dream up something to see if it would work.
Regards,
Charles Hill