Originally Posted by MoRaLeSD
My only problem is that when I reduce the throttle to make the Tricopter come down, is not coming that stable. Its like it feels that is going to flip or something and is correcting really fast. I know that I should adjust the gains but I don't really know what settings I need to adjust.
One of the problems with any helicopter is rapid vertical decent. The heli gets caught in it's own downwash, a little off to one side and it tilts a lot. It will always be off to one side.
Adjust your P gain (aileron / elevator = roll / pitch) up or down to see what makes it better. I am guessing that you need to increase your P gain, but if you increase it too much, you will get oscillation. The way to increase it more without oscillation is to flash your ESC's with SimonK.
If you see oscillations in fast forward flight (or in wind) you need to reduce the P gain.
Here is a video about tuning your gains: