Before a tank swap I typically pop FoF. Then I que up savage blade / voke / sprits /savage / RoH / CoS. If I can't que savage I just FoF / Spirits / solo RoH / CoS then do my typical rotation. If healers / dps are snapping hate right after your voke then it seems the other tank does not have a solid lock to begin with. Now if you took hate from the other tank and then lose it a couple mins later... well that's something on your end. Make sure you have Shield Oath up. Some of us like to squeeze the extra dps and switch to Sword Oath when not tanking the boss and sometimes people forget to switch back. Either way you should not lose hate that fast.