From: Lima and Toronto
I tried it some time ago, and I found that a main limitation with it is that all cargo will flow from one, and only one "home port". Yes, it is a L10 port...but it will still be a huge bottleneck, plus there is the reduced flexibility compared to a "hub" system; like having a Tokyo-Truk major route and then source all SE Area small bases from Truk.
So with autoconvoy; if Buna needs supply or fuel, it will flow from Osaka (L10 port) into Buna (L1??); I am not sure how the AI will pick the ship, hopefully it will pick one that is smaller than 6K tons, because if not, it will take forever to unload, not to mention forever to arrive, besides, I don't know if there are ships that are small enough to fit in a L1 and have the range for the long trip (including return)
A better solution is to have a "CS convoys" to/ from "hubs" and manage the rest as needed. In my example, all trade between Japan and SE Area through Truk (L6??); and from Truk manage all the small bases; moreover, you can add aditional levels like having Rabaul as secondary hub:
Japan --> Truk --> Rabaul --> New Guinea bases
Japan --> Truk --> Kwajalein --> all 4th fleet bases
With this you can have a big stockpile in a major base, and use the small ships to service the garrisons as soon as you get the alert of low supply
Another point; if you go with auto convoy; be careful with the tankers; you want to protect them as much as you can, so at least for these, use "CS convoys"