Thanks. I dont think that using Sacred Harvester for this is good idea, for exactly same reasons you described.
I asked only because i completely forgot about Wormwood and have feeling (wrong ) that u were using Sacred Harvester (which surprised me).
for generic speed builds (i.e rift/grift) sacred harvester is great since it's trivial to maintain stacks to feed the "soul to waste" speed boost.
to clarify, I used wormwood in order to drop "locust swarm" from the bar and still maintain the RoE/bakuli buffs, pestilence is not needed since we are only fighting a single boss. The dogs + "fierce loyalty" is a much better option imho for a consistent speed boost. But as always with these special conquests, there are many ways to complete them I guess, and trying out different builds is hopefully part of the fun. good luck
Did it solo at 2nd attempt with my wd, it's nothing challenging well im almost sure that i could o it at first attemtp but ive got bandit shrine and when i seen that its totally doable i take the shrine and done it once again
I tried first with wrong type of DH builds 5-6 times, switching to danettas when needed. I tought I cannot do much greater run speed and boss killing takes relatively low amount of time. My best time with the first builds was like 21:30 and I felt I never will finish this.
Then I switched to impale and got it done in about 18:40: There was very big difference in boss killing speed, which also skipped some waiting-parts.
Running speed was nice with shadow power, krelm, warzechian armguards and two speeding passives that both were activated by vault.
With an Impale speed running build I finished this solo in 16:48. Shift clicking impale once and tumbling 5 times makes you super fast and I probably could've done this faster if I knew the potential paths to the bosses better.