I only sign with programs that have negative carryover if I think I would be depriving my players of a great experience if I didn’t.
So as a rule I will not work under those conditions, but I have made an occasional exception.
When the carryover kicks in, I give it one month. Then, if it hasn’t shrunk down to where I can see the end of it, I ask to have it removed. If the answer is no, I pull the program until things are settled.
Then I reconsider whether it is worth it to put them back or not.
As a rule of thumb I just avoid advertising places with negative carryover. There are plenty of good places to choose from that don’t.