re the 250 elemental mag, yes fair enough - 1400 would be about what I would get if I took multiples of my pills. I just take one at a time though. 581mg mag glycinate delivering 100mg elemental mag.
mag and calcium work together on muscle function. not enough magnesium, you can end up with stiffness, spasticity. too much mag, you can compete with the calcium too much, resulting in muscle weakness.
so, this uric acid number, still a bit of a mystery then. did you ever take inosine?
my approach: no meds so far - just nutrient-dense anti-inflammatory whole foods, and supplements where needed
info: www.whfoods.com, www.nutritiondata.com