That is a fair point and i tried that. I think the problem lies with the stamina potions (2), (3) and (4).
I decided to watch the script for a couple of hours and what i found was:
1. if it ran out of a certain potion dose it would remove the place holder for it and using the bank all method it would bank one of the rune pouches every trip and withdraw it manually every time it banked.
2. Sometimes (rarely) it would not click the deposit inventory button in the bank and it would do the trip with runes in the inventory.
3. Sometimes it does not empty the entire large rune pouch and it'll teleport with some essence still in it. It tries to withdraw the essence to fast from it.
I decided to only have one dose stamina potions in the bank and it seems to fix problems 1 and 2. I ran the script over night and it went like a charm. Some runs it wont empty the entire large pouch but that is such a minor inconvenience for what the script offers. I'm very happy with the purchase. It's really worth buying it, got me 30-69 RC doing ZMI in a few days :).
https://gyazo.com/bbe1ca4dcfec7f1a13c9274b1ef9c9f4