^ Don't know TTD exact forces, but a -1,2G spike is an ok value for a top hat. They usually have a section where you reduce Gs to about -1 (I usually set -1,3Gs as a maximum), then a bump section where force increase about 0,5Gs (and decreases again) and repeat for the other side.
Crappy drawing I made. I know I wrote 0 instead of 0,5Gs, but there is no exact number.