I'm attempting to reduce the thickness of the spokes circled in blue:
The intent is to make them slightly less thick than the other spokes purely for visual effect, so I'd like to cut about 5mm deep from the face. My first instinct was to wrap a sketch to the face of the wheel, then cut the desired amount. However, when I did that, here was the result:
As you can see, it's a mess. What's the best approach to get the results I want? Attached is the file in question. Thank you in advance!