Depends a little bit on how you define conservative. To some, it means leaning adult. Too others, it might mean slow to add any new music until it gets into it the top 20-30 on the national CHR airplay chart. I would say the above examples are good ones. WZYP has a reputation for leaning adult. KSYN pretty much plays only songs that reach the top 20-30. WNDV probably wins the award for the lowest amount of power rotations. Currently, their "powers" are no more than 55 spins a week.
Up until recently, I would put just about all Cumulus stations. However, some of those stations have sounded more aggressive and given more freedom to deviate from the national consultants/charts. Some of the smaller market Cumulus stations recently put Disturbed "Sound of Silence" into rotation.