I am new here but I have been struggling with a problem for a while, I have an F450 Frame and a DIY drone but my vibrations are very high. I have already mounted foam tape under the pixhawk other propellors but unfortunately it does not help. Does anyone have any advice?
Check if your props are balanced. Balance them (http://www.droneybee.com/balancing-propellers/ or any other guide). Then turn on high rate logging (parameter sdlog_profile) This is very high vibration indeed. Check all screws, wires, etc. but first, check your props. Also note that sometimes foam can show increased signs of vibration depending on how it is mounted, it’s density, etc but start at the props then check everything is tight and tied down.
Try flying with a 3S battery , just the see if it makes a difference.
If you look at the chart the motors bottom out (saturate) which could be why when you descend things are a bit off. It wants less thrust but it’s bottomed out.