OP's numbers are wrong here.
1100 tenacity (the difference between the 2 sets you linked in comparison) does not = "8% damage mitigation"... 1100 Tenacity is exactly 5.5% dmg mitigation, as it's 200 points of tenacity per 1% mitigation.
And it would be at cost of just under 2.5% DPS.
That means, at a very end build, you can either max tenacity for 5.5% dmg mitigation, OR avoid as much Tenacity as possible, and gain just under 2.5% DPS.
Also, SKS does not affect Sword Oath or auto attack speed btw.