I'd still say Unyielding Sentinel for monk tanking. 15 (Earth) + 10 (Unyielding) + 20 (Unbreakable)=
If you really want to tank, I think CE is a must. Twist in Standing with Stone and ICE for another 35.
PRR is then 80. Add 9 from Adamantine Cloak of the Bear to reach 89 for ~38% damage reduction.
Also, don't know what your load out is, but the Sun Soul set bonus gives 25% damage reduction for 10s ~every 25s, granting a stacking ~10% reduction for a total physical damage reduction of ~44%.