>>>If I recall correctly, I think it is 140-160%, hollow bar with same OD but thicker wall.<<<
Sounds like you may be using the stock rubber bushings. You can affect the net rate about 20-30% by going softer or stiffer with the mount bushings. They can be changed from the wheel well. But you'd have to face those allen bolts again. The shortie hex and Sears ratchet I used really helped out when I changed my bushings. Big time saver.