stricken has no influence on elite, only rift guardians
Well each subsequent attack will deal more dmg so it does do something to elites, buy y, the rank 25 is 25% dmg to bosses and rift guardians only, not elites as Autiwa claimed.
OT: ofc it's not worth it for TX but tbh i don't even change gems from grifts to TX, for the last 3 patchs everything on TX just melts so easily that you don't really have to worry about that anymore...
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Those Who Do Not Know True Pain Cannot Possibly Understand True Peace...
As everyone else has pointed out, stricken is rarely (almost never) useful in TX. Based upon your post, I would recommend;
Bane of the Trapped, as jade harvester uses haunt and/or locust swarm, both of which should proc the primary. The secondary is also likely to proc the primary due to soul harvest's radius (18 yd; just above the 15 yd radius of the secondary).
Bane of the Powerful, which provides a fairly consistent dmg bonus throughout the run (assuming no deaths), and offers some protection against elites.
Enforcer, as you have mentioned that your build has some level of focus on pets. It should be noted that a significant portion of your dmg must come from pets for this option to outweigh Bane of the Powerful, which is unlikely in most jade harvester builds (often focus much more heavily on DoTs, rather than pets).
As for Pain Enhancer, I would argue against this selection, as Increasing atk spd does not appear to have any effect what-so-ever on the dmg applied by DoTs, such as haunt and locust swarm (as evidenced by D3Planner). In the event that this is to benefit pets, Enforcer would be a significantly better choice, as it offers a multiplicative dmg bonus as well as unparalleled pet survivability.
Honorable mentions also go to Boon of the Hoarder and Wreath of Lightning for their move speed bonuses, which greatly improve bounty/rift farming efficiency.