Well, I found a way to solve the problem of leader not picking items in town. There's another guide/setup 4 man party in the forum. It's by Phelon (here:
https://www.thebuddyforum.com/threads/phelons-playground-4-man-botting-routine.403317/). It's modified trinity does solve this problem. What I've done is download its zip archive. Inside that there is a trinity folder. Unzip that one and overwrite the one in your db/plugins folder. WIth that, I've tested and it works ok. I do NOT overwrite autofollow, cause Tempest's one is working simply amazing, and also I continue using Tempest's modified routines.
@Tempest, can you try to see why Phelon's modified trinity is working ok with leader picking items in town and integrate in your modified trinity? Thanks!
EDIT: Something strange happens with that option... When the rift is finished, all 4 bots take a lot of time to pick up items dropped. Even once, my zbarb went back to town not picking items...