I think Sea Biscuit has a novel approach to rig tension. They leave the shrouds alone, and adjust the forestay. When it blows, they crank the headstay tighter and that automagically tightens the shrouds. Or at least that's what I was once told. Unfortunately, I don't have any quantitive numbers.
On Lake Michigan, when it blows there's usually a bit of wave associated with it. While we're sometimes able to carry a #1 in 25 kts when it's really flat, we have generally switched to a 2 or 3. The terrible thing about having a decent 2 is you have another choice to make
As to rig tension, we leave the headstay alone and crank on shroud tension. Like Bob Rutsch, I remember loose gauge numbers and not pounds. With 1/4" rigging I put about 45.5 on the uppers, and 44.5-45 on the lowers. With a flattening reef, our main can be really flat with the backstay pulled down to just below the stern rail.
I'm afraid I'm not coordinated enough to handle main trim and steer in those conditions. We keep the main sheeted pretty hard, and the main trimmer is working the traveler. When we're working well, there's quite a bit of conversation between the trimmer and driver.
As to rigging changes, we've moved our backstay adjustment forward and double ended so the helm or main trimmer can adjust it. We also have a fine tune on the main so even my daughter could crank on an extra inch when it's blowing 30.
I think we're one of the faster boats around here upwind in a breeze. Downwind, some good crew work seems to keep us in the hunt.