Bill, couple of thoughts on your post. I have the Helibridge on my 2014 ES and made one adjustment after riding for awhile. My guess at what could cause movement after proper torque on the handlebars would be 1) not clean surface under the handbar contact point and bridge contact point. I've noticed before that dust/water/dust/water combination can cause fine dust particles to cake up under the edges of the handlebars.
If you then move/adjust them and position on top of this dust under the edge, you would be able to torque properly and still have the dust "lubricant" under the handle bar. Just a guess...
My other comment. I've had Helibars on four bikes over the last 10 years, 2 FJRs, a 1200RT and a ST1300, about 180k on them. One thing that I noticed early on with my riding style was that I tended to lean heavily on my wrists, the reason that I put the Helibars on in the first place of course. After mounting the Helibars, they gave me the "opportunity" to take this weight off my wrists, but it is just an opportunity. What I learned about my riding posture early on with ST bikes, because of street bike experience I think, was that I still sit further back in saddle and arched over handlebars and still had wrist issues.
My MO for quite some time is that when I find I am getting numb hands or wrists are hurting, I am unconsciously reverting back to that "too forward" style. If I move my butt forward in the seat just a bit and focus on keeping pressure on my fingers (like you are pulling back on the bars) instead of pressing forward, it puts my back into the correct posture, hands go to full feeling again, wrists have no problem and my back doesn't get tired.
If your wrist pain is mostly on the outside of your wrists, adjusting the helibars further back will narrow the handlebar angle and will, IMO, cause your wrist pain to get worse. Just some semi-informed thoughts...
I ride daily (commute) and find that I start falling back into this bad posture when I'm paricularly tired even after 10 years on ST's and need to refocus on posture to keep my hands and wrists comfortable. I'm a firm believer in the Helibar product.
Jim