By VCDS High mode higher and Normal mode lower?

Hello, I want to lower my thickness by means of VCDS, i.e.: I imagine to lower the normal mode by 10-15 mm, and that it is 10-15 mm higher in high mode than now, i.e. the lifting value should change from 25 mm to 45-55 mm. The lowering alone works quite smoothly over the individual channels. But this works with the additional raising somehow or is fixed the standard raising value of 25 mm for high mode and can not change Google has not spit out anything. Thank you for your help. Greetings