Middle sailing refers to a state where things are neither too good nor too bad, but fall somewhere in between. This scenario calls for synonyms that capture this idea. One may use the term "fair sailing" to describe a situation that is not too difficult nor too easy. Another possible synonym is "mixed sailing," which implies a combination of advantages and disadvantages. If things are progressing but with some challenges, one may use "steady sailing." Additionally, "moderate sailing" gives the idea of a situation that is not extreme. Therefore, "intermediate sailing" is a good alternative. Overall, these synonyms can be used interchangeably to convey a sense of being in a middle ground.