I haven't had any shaking issues or any other issues. I've had the setup for almost 2,000 miles and I drive a lot of highway around 70mph. City and highway driving has been fine. Feels stock.
The tires aren't rubbing any suspension/steering components in the front? The stock tires are pretty close already. Can you please post a picture from straight on to see the side profile? Looks good man!
When you have time, could you please take a couple pics from straight-on front and back? I'd like to see how far the tires stick out from the fenders. Also, in your estimation, do you think you could get by on 1" spacers?