Amos,

Do you have the access hatch under the steps/sink?

The lead is about 2' down from there , so maybe a foot or 10" below the aft end of the bilge as you describe it . I can get you a measurement from a known point to where the drop should be
I have my sump back there and down there and it takes a hell of a lot of water to fill it up.

Commander 105 has be filled and/or glassed over too .

I have a monel water tank under the floor boards and dont want bilge water near it if I can help it .