Usual is to do a static tune to 10% of breaking strength then dynamic tune under sail. Local conditions sometimes dictate variations, San Diego tune is loose for light winds, San Francisco is tight for higher average winds. My rigger and I disagree because I'm from SF in SD and got the tightest rig on the dock, but I like it that way.
I do my own but it's old school straight rig, don't have a clue on swept spreaders, and once asked 3 riggers crewing on a race boat how you tune a B&R and they all just shrugged. I'd encourage you find the very best rigger in your area, not the cheapest or most available.