Okay your almost there with the schematic.

After reviewing the factory drawing it looks as the wiper motor needs power from the 16PK wire to send the motor to the park position. We can fix that as follows:

1. Remove the ground jumper from the On Off top switch section.
Replace that ground with the 16PK as in the factory wiring.

Remove the jumper that runs from the same electrical point (on the On Off switch) (where you removed your ground above) to the second switch for the High Low speed selection.

2. On the relays for the Low High speeds wire them as listed below:

Low Speed switch output 18RD wire to Low speed relay coil point 86 and ground to point 85

Low Speed relay Run the fused 12V power to point # 30.

Low speed relay output to Low speed on motor on point # 87


High Speed switch output 18GN wire to High speed relay coil point 86 and ground to point 85

High speed relay Run the fused 12V power to point #30

High speed relay output to High speed on motor on point #87

Redo the drawing like that and I think we have a keeper