Great changes proposed to make other tanks relevant. I love that ice staffs now count as 2 set pieces removing one of the obstacles to staff tanking. Now please make this change: Ice staff heavy attacks no longer taunt enemies. Elemental Susceptibility (morph of weakness to elements) now costs magicka, no longer gets refreshed on damage, but taunts the enemy for 15 seconds and grants you a shield for 10% of your max health.
Not giving it major fracture separates it from pierce armor (1hs taunt), and giving it a small shield fits the theme of ice staffs. Major fracture can still come from a stamblade, stamden, or stamDK in the group.