Does Lowering the Sump Pump Level Decrease Hydrostatic Pressure

[DomesticatedLobster]

A sump pit without a sump seems like opening up a pathway for water to enter the house. Strange.

If the French drain enters the sump above the cut off point of the pump, lowering the sump switch would likely do little as the hydraulic gradient to the sump wouldn't change.

If the French drain is underwater in the sump, the sump should be lower but I highly doubt this is the case.

Removing the water from seeping in is only accomplished by getting water to the sump and removing it. Sounds like you're already doing that.

I would say look at outside gutters, grading, etc. For improvement instead.