Putting spacers in the front, without adding camber (or lowering the car which adds camber on our suspension type) is going to make your scrub radius less negative.
If you want to add spacers without affecting the steering geometry you should get camber plates or lower the car a bit.
For extra points, use the formula in
this post to figure out the camber you need to not affect steering.
Read
this thread for more as to why scrub radius matters.