Don’t forget that you can take holy revenant and also use an other keystone.
That is true. But, I had always the feeling that you cannot avoid to get hurt with TH and that martyrdom has, at least, an attack speed bonus interesting.
For me, piety is the most powerful keystone, but inexorable judgment is just behind it.
But, I would say that I would not run an other keystone than martyrdom with an hammer.
I have same experience, but never with an hammer… and only with a toughness critical orientated build.
(and not as good result as you seem to record… I take more than 20… yesterday I did one where I recorded something close to 100 damages on auric histg. And also I tend to do also errors… so this is not all the time that I play well like that without errors).