A tad bit more info
A friend of ours at our YC has a Pacific Boats-built 911s. I forwarded the question over to him. He club races his boat and formerly raced a J-24 for many years.
His comment:
"I really can't offer anything of use. I looked around when I got the boat and given the somewhat unique nature of he rig, I couldn't find much. Also, this is my first exposure to rod rigging and wouldn't even know how to measure tension. I just set the mast, centered it in the boat and tightened the rig to straighten the mast. Then over the next few weeks would observe the mast in different conditions and set it up like any standard tuning where as the wind increased the mast head would drop off some to leeward. I control the head stay with my backstay changing overtime to the conditions."
I would note that the 911s rig resembles the double-spreader parallel shroud scheme on my O-34.
I do not know if the 911s uses runners to stop mast pumping when in rough seas. We have them and only have ever used them in the ocean.
I also once had rod rigging, on our prior boat, the Niagara 26. I also used a rather basic tune for that rig, with a little slack on the lee side shroud in strong winds.
Our present Olson 34 has all wire rigging, FWIW.
regards,
Loren