I think the first thing to check is are the wheels and spacers seared correctly. You’ll need to lift be wheel off the ground to make sure it isn’t loose.
You need to do this to check it’s safe to drive. If a wheel is not seated correct it could easily shear the studs and fall off. Make sure all the bits are torqued down.
If this is ok, swap front to rear and see if it makes a difference. If it does then it could be the wheel balance.
If not it might be something else. Check there is no play on the hub or normal play in the wheel bearing. It is possible for the flange bolts to come loose on the hub.
Putting on spacers and wider rims may simply be highlighting an issue that was already present.