Concerning now the mission above which is not bad at all for a first trial, I'd be curious to see its design. My impression is that you jumped for a "focus waypoint" to an other "focus waypoint". If true, this doesn't give the smoothest gimbal movements. What I recommand (and what I use always) is to build the mission with this help for fixing gimbal pitches and headings at all waypoints and once this is done, to systematically switch to "interpolate" and to set waypoint numbers to "none" in the hub.
Here you are:

Mission Hub - Litchi
Litchi's Mission Hub lets you plan waypoint flights and later execute them using the mobile Litchi app.

Next time I will definitely go for the "interpolate" tip.