Had the wheels checked for balance today as there was a slight shimmy in the steering at about 120 kmh. Took the wheel off at the shop and found this:
Hub centric ring had snapped clean off!
Luckily, my buddy that owns the shop had a spare set of 15mm H&R spacers and I was able to get one from him to replace it. Now I'll have to see how good the warranty is from H&R!