a good way to check if you are going to be able to return to your home point ,after you take off go up 20ft turn into the wind and see what the MM is doing ,is it struggling to hold position if it is at 20ft it will definately be at 150ft,,as the higher you go so the stronger the wind ,if you are happy with the wind try to position yourself down wind of the place you want to film that way the wind will assist the MM on the way back,and once you have finished filming in C mode you can change to P mode for the return journey and also reduce some height if appropriate,if you do a RTH then the return speed is set and the height is what you set it to in the app,