The Rule of Thirds, look that up it might help.
I can tell when your frames are dropping due to your settings. You may want to crank down settings like visible range and objects when filming close in. And limit motion when filming wide (i.e. airbases, cities, etc.)
Use fog and haze to your advantage and use the mission editor to place aircraft, objects, troops, etc. sparsely (but close enough) to add depth to your shots (i.e. when filming airport ops).
Some people like 60fps (live look and easier to to do slow-mos with) uploads others like 24-30 (more cinematic look). I say it depends on what you want to. You can mix the two (i.e. special effects, flash backs, time-lapses, etc.), but try to be consistent with your base FPS.