Quick question. Wife has a '12 Murano that we just had tires put on (265/60/18 Nokian Rotivva a/t's). She likes them, which is want matters, but at highway speeds they shake the whole car. 3 oz. of balance beads were put in each tire. Now, here's the question...Can different brands of beads be mixed in the tires? I don't know what brand beads were put in, but to try and help the shake I was going to put 3 oz. more in each tire (to total 6 oz. per tire). I was going to use Counteract beads which I have in my Harley and have no issues with. Thoughts?