To make dry brine: In bowl, mix salt, sugar, brown sugar, lemon thyme, garlic powder and pepper. Place salmon on cookie sheet and cover with brine. Refrigerate 10-12 hours, or overnight.
After brining, rinse salmon completely. Dry with paper towel and let rest at least 1 hour.
Heat grill to medium heat.
To make glaze: In bowl, mix brown sugar, ketchup, mustard, apple cider vinegar, Worcestershire sauce, garlic and ginger. Add salt and pepper, to taste. Brush over salmon.
Place cookie sheet with glazed salmon on grill and cook 15-20 minutes until internal temperature reaches 130 F. Let rest 5 minutes before serving.