I hope someone can help with this.
Location: Japan
Car Info: I recently got new wheels went up to 18x9.5J+15 from 17x9.5J+20. Wrapped in Hankook Ventus V12 evo2's. I had to use spacers in the front to get the wheels to clear the Calipers as well as get extended Wheel Studs. wheels were balanced by a dealer
Issue: When i got the wheels on I noticed i had a slight wobble in the steering wheel around 60KPH. So i went in and had the Tires balanced once again, which alleviated the the wobble at 60KPH but shows back up if i hit a hard bump or get up to +80KPH where its sometimes fine. But at 100KPH its a bad "wobble" in the steering wheel.
I took the car to a local tire dealer and they said they could not duplicate the issue ( Which i think is BS) I've searched google and forums with no avail. Could this be a Alignment Issue? or suspension issue??
any insight would be much appreciated.
Thank you