I don’t have a picture right now, but the rpi and navio2 are in a 3d printed case with a cover (Navio2+RPI2 Case by Kija - Thingiverse). I will add some foam on the barometer and perform further testing this weekend.
Thanks for your guidance, and I will let you know of my progress.
After the foam was added, I flew 3 times successfully. The hexa followed my waypoints nicely.
I notice I don’t have the spikes anymore in the baro reading.
I now have another problem where my landing gear is not behaving as expected, but that deserves another thread. Thanks for your help Igor.