The overwinter goals are to be reviewed every 3 years for each unit(by rule), BUT if you aren' t there at your unit meeting(where you hunt) and bring it up(or someone) and vote to raise it, do you think they are going to mention it ?
In 1 area I hunt, it was 20 and we voted(the people in attendance) to raise it to 30. The dnr rep said we could only raise it to 25. No more than 5 at once. Now, nowhere have I found this in stone or law.