It has taken a while for the penny to drop for me 🙂

It is obvious that these 150 free listings also use up the auto free re-listings and the listings usually disappear before we get new listings on.

Maybe, list as many new items on the first few days (don't leave them to the end or you've run out !!)  then, when you get to 150, the re-lists will just go back normal ... .or, remove the auto re-list from some of the items at the beginning, then you can re-list them at the end if you have enough freebie left.

Does this make sense ?    Maybe you've worked it out before, but I'm a slow learner 🙂