Rend/Broken Promises inconsistency

Rend doesn’t crit, but I’m and yet I’m getting some huge inconsistency. I can get BP to proc at 5 HC, sometimes 6, 7, 8, 9, 10, and sometime not at all. Could this be a bug? The idea was to HC 5 times(w/ AD), proc BP, and then Ambo/Rend. I used Stomp to tightly group trash and Elites in order to make that I hitting a target. I even tested with Ravage for the 18 yards radius, for the same reason and no improvements.

https://www.d3planner.com/499738408

Broken Promises lives up to its name. It has a substantial cooldown after its effect is activated, 3 seconds iirc. Broken Promises might have been viable before being nerfed back in 2.3 or whatever; but currently the ICD of the legendary effect affects Broken Promises’ uptime to such an extent that just your raw sheet crit chance is much more beneficial both in the short term, and the long term.

Thx for the response. BP has such potential. It should re stored to it’s original mechanics.