The best way to alleviate the shortage would be to allow you to designated a second character when tanking or healing to recieve vaults. I like tanking I don't tanking because I don't want to do more than 8 10s a week I don't find it fun. The other thing that would help a lot is dropping the 1/6 mythic to 8 and have 10 be 2/6 mythic items.