Paladin Charges

It would be 85% multiplier with those charges yes, except I think Divine's a bit higher due to CO.

I haven't seen anyone post numbers on threaten's success rate, I would guess it's around 25-50%.

 36/57

1/2
2/3
2/2
2/4
2/4
2/3
3/5
4/5
2/3
1/2
0/2
1/3
2/2
2/4
3/3
1/2
1/3
5/5

63% success in test on regular mobs. Don't know if it's like PG and works half as well on bosses but it's certainly possible.