Ai gresit o poza! Verzisorii!! Check if its not bottoming out on the bump stop. When i fitted -40 eibach springs had to cut some of the bump stop on the rears.
I had Vmaxx on a mk4 GTI years ago. They were OK but not great. Definitely not as yeah as you describe, but a lot of ride comfort is down to personal preference. I would say it’s definitely worth checking the rear bump stops as it sounds like they might be bottoming out, or at the very least severely limiting the travel of the damper. Could save yourself a lot of money if the solution is just chopping them down.