I don't know if you are aware of this but if you got 10 traps in inventory and your hunter is lvl 60 it will try to setup more then 4 traps which stops the bot. This is on OSRS btw.
While doing steel bars it withdraws the iron with the X option. Just make it withdraw the 18 coal then do withdraw all or withdraw 18 from the previous X option used for the iron. This would speed it up a bit.