I had a similar issue with my Sharps, and My brodix heads. I had to do 3 things. I bought the tool steel retainers, I used a -.050 lock, and I had to shim up my rocker stands. I had to go .080 shim under the stand, and Ryan at Shady Dell hooked me up on them. I have pretty good clearance now. No issues yet, but its still on the stand.

Waiting for TTI to send me 1 header tube for my headers, ine got a little F'd up somehow.

Kasey