Thanks for the clarification.
So the pain is that once the tape with the first increment is overwritten, other 4 tapes with increments are still protected despite those increments are already useless. Is that correct?
If a tape can fit more than 1 increment, I would suggest to create a new media set
not every day, but once a week (Saturday) and set 2 weeks retention. It will also allow you to use less tapes, so the space will be used more efficiently.