X-Sim Assetto Corsa math

[bitnuker]

Hello,
I´m running two bass shaker with a second soundcard and added an output for gear change effect in the math setup and everything works great so far (two axis for frequency and volume). Now i want to add effects for curbs and bumps and tried to do it with effect 26 (vertical force). I tried a lot of settings but its always to much and its always shaking when i´m driving. Can someone help me with this or have a good profile which i can use? Thanks in advance!