It is just at higher speeds, the steering wheel doesn't shake. so it suggests to me that it isn't the wheels. Have you any pics of your axcle so i know what to look out for?
I wound down my coilovers some more, so i guess that wasn't the best move haha
I don't have any pictures of it right now but I can try to get some for ya. The only way I could see the bend in it was after I replaced it and rolled it across the ground. I could see the bend moving up and down as it rolled down the driveway. My steering wheel never shook, I could just feel it in the car. Even today, my tires are feathered like I wrote above which causes at humming noise almost like the wheel bearings are going out, the wheel doesn't shake but I can feel the vibration in the car. It's not bad but I can feel it's there.