I finally found a body with 5 bio signals last night. I got 5 screenshots as close as I could without any appreciable change in size. I'll compare them this weekend, not enough time to do so before then.
The process of finding and scanning was a little time consuming. Tussock was in very small areas, so I knocked that out first. Bacterium, aleoida, and stratum were easy as well. They were everywhere. Finding the valuable osseus would have been an exercise in futility using color as a guide. The planet was mostly a huge rolling desert, and I know osseus only grows on rocky areas. Checking the rims of large craters, while ignoring everything else, worked quite well.
Edit: Nothing visible to report. All overlaps between possibility zones looked the same.