Low wing planes should be balanced upside down. (wheels in the air!)
try that, and see what is required.

Where did you place the weight? You want it to be as far forward as posible.. the more forward you put it, the less you'll require.. Add it to the front of the firewall, not under the fuel tank...

Yes, 1lb sounds a bit drastic for a 40. sized plane, but not uncommon. Well, rarely..