Is anyone running solid riser bushings on a Dyna? Any drawbacks, like buzzing in the bars?

I might need to tilt my risers forward a bit. It looks like angled bushings only come solid, not poly.

 

Why can't you adjust the angle via the riser clamp?

 

I switched to poly bushings recently. I'm sure theres more vibration there now then with rubber, but I haven't noticed any real difference other than I can't wiggle my bars back and forth anymore.